[{"data":1,"prerenderedAt":8076},["ShallowReactive",2],{"page-\u002Fdart\u002F19-exercises-and-projects":3},{"id":4,"title":5,"body":6,"description":8069,"extension":8070,"meta":8071,"navigation":71,"path":8072,"seo":8073,"stem":8074,"__hash__":8075},"content\u002Fdart\u002F19-exercises-and-projects.md","Dart — Production Projects & Capstone Architecture",{"type":7,"value":8,"toc":8055},"minimark",[9,13,18,27,1757,1761,1772,2806,2810,2813,4496,4500,4503,4513,4518,4738,4742,6787,6791,7450,7454,7542,7546,7692,7696,7710,7819,7826,8051],[10,11,5],"h1",{"id":12},"dart-production-projects-capstone-architecture",[14,15,17],"h2",{"id":16},"project-1-production-cli-argument-parser","Project 1 — Production CLI Argument Parser",[19,20,21,22,26],"p",{},"A CLI tool with subcommands, validation, and exit codes. Demonstrates ",[23,24,25],"code",{},"args"," package, exhaustive switches, and error handling.",[28,29,31],"code-wrapper",{"language":30},"dart",[32,33,37],"pre",{"className":34,"code":35,"language":30,"meta":36,"style":36},"language-dart shiki shiki-themes github-light github-dark","import 'package:args\u002Fargs.dart';\nimport 'dart:io';\n\n\u002F\u002F ── Subcommand definitions (exhaustive enum) ──\nenum Command { convert, info, version }\n\n\u002F\u002F ── Temperature units (enhanced enum with conversion logic) ──\nenum Unit {\n celsius('°C', 'Celsius'),\n fahrenheit('°F', 'Fahrenheit'),\n kelvin('K', 'Kelvin');\n\n final String symbol;\n final String name;\n const Unit(this.symbol, this.name);\n\n \u002F\u002F\u002F Convert FROM this unit TO Celsius.\n double toCelsius(double value) => switch (this) {\n Unit.celsius => value,\n Unit.fahrenheit => (value - 32) * 5 \u002F 9,\n Unit.kelvin => value - 273.15,\n };\n\n \u002F\u002F\u002F Convert FROM Celsius TO this unit.\n double fromCelsius(double celsius) => switch (this) {\n Unit.celsius => celsius,\n Unit.fahrenheit => celsius * 9 \u002F 5 + 32,\n Unit.kelvin => celsius + 273.15,\n };\n\n static Unit parse(String s) => switch (s.toLowerCase()) {\n 'c' || 'celsius' => Unit.celsius,\n 'f' || 'fahrenheit' => Unit.fahrenheit,\n 'k' || 'kelvin' => Unit.kelvin,\n _ => throw UsageException('Unknown unit: $s', 'Use c, f, or k'),\n };\n\n double convertTo(double value, Unit target) =>\n target.fromCelsius(toCelsius(value));\n}\n\n\u002F\u002F ── The parser (top-level, reusable) ──\nArgParser buildParser() {\n return ArgParser()\n ..addCommand('convert')\n ..addCommand('info')\n ..addCommand('version');\n}\n\n\u002F\u002F ── Entry point — thin, delegates to handlers ──\nvoid main(List\u003CString> arguments) {\n try {\n final parser = buildParser();\n final results = parser.parse(arguments);\n\n final command = results.command;\n if (command == null) {\n printUsage(parser);\n exit(64); \u002F\u002F EX_USAGE\n }\n\n final cmd = Command.values.firstWhere(\n (c) => c.name == command.name,\n orElse: () => throw UsageException('Unknown command', ''),\n );\n\n final exitCode = switch (cmd) {\n Command.convert => handleConvert(command),\n Command.info => handleInfo(command),\n Command.version => handleVersion(),\n };\n exit(exitCode);\n } on UsageException catch (e) {\n stderr.writeln('Error: ${e.message}');\n stderr.writeln(e.usage);\n exit(64);\n } catch (e, stack) {\n stderr.writeln('Unexpected error: $e\\n$stack');\n exit(70); \u002F\u002F EX_SOFTWARE\n }\n}\n\nint handleConvert(ArgResults args) {\n if (args.rest.length != 3) {\n throw UsageException(\n 'convert requires 3 arguments',\n 'convert \u003Cvalue> \u003Cfrom> \u003Cto>',\n );\n }\n\n final value = double.tryParse(args.rest[0]);\n if (value == null) {\n throw UsageException('Invalid value: ${args.rest[0]}', 'Value must be a number');\n }\n\n final from = Unit.parse(args.rest[1]);\n final to = Unit.parse(args.rest[2]);\n final result = from.convertTo(value, to);\n\n print('${value.toStringAsFixed(2)}${from.symbol} = '\n '${result.toStringAsFixed(2)}${to.symbol}');\n return 0;\n}\n\nint handleInfo(ArgResults args) {\n for (final unit in Unit.values) {\n print('${unit.name}: ${unit.symbol} (${unit.name})');\n }\n return 0;\n}\n\nint handleVersion() {\n print('tempc v1.0.0');\n return 0;\n}\n\nvoid printUsage(ArgParser parser) {\n print('Usage: tempc \u003Ccommand> [arguments]');\n print(parser.usage);\n}\n\nclass UsageException implements Exception {\n final String message;\n final String usage;\n UsageException(this.message, this.usage);\n @override\n String toString() => 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Zero intermediate allocations.",[28,1773,1774],{"language":30},[32,1775,1777],{"className":34,"code":1776,"language":30,"meta":36,"style":36},"import 'dart:async';\nimport 'dart:convert';\nimport 'dart:io';\n\n\u002F\u002F ── A lazy pipeline: read → parse → filter → transform → aggregate ──\n\u002F\u002F Each stage is lazy (Iterable or Stream) — no intermediate lists allocated.\n\u002F\u002F Data flows element-by-element through the pipeline.\n\nclass LogEntry {\n final DateTime timestamp;\n final String level;\n final String message;\n const LogEntry(this.timestamp, this.level, this.message);\n\n factory LogEntry.fromJson(Map\u003CString, dynamic> json) => LogEntry(\n DateTime.parse(json['timestamp'] as String),\n json['level'] as String,\n json['message'] as String,\n );\n}\n\n\u002F\u002F ── Stage 1: read lines lazily (streaming — constant memory) ──\nStream\u003CString> readLines(String path) {\n return File(path)\n .openRead()\n .transform(utf8.decoder)\n .transform(const LineSplitter());\n}\n\n\u002F\u002F ── Stage 2: parse JSON lazily (sync* — pull-based) ──\nIterable\u003CLogEntry> parseEntries(Iterable\u003CString> lines) sync* {\n for (final line in lines) {\n try {\n yield LogEntry.fromJson(jsonDecode(line) as Map\u003CString, dynamic>);\n } on FormatException {\n \u002F\u002F skip invalid lines (don't crash on bad data)\n continue;\n }\n }\n}\n\n\u002F\u002F ── Stage 3: filter by level (lazy Iterable) ──\nIterable\u003CLogEntry> filterByLevel(Iterable\u003CLogEntry> entries, String level) {\n return entries.where((e) => e.level == level);\n}\n\n\u002F\u002F ── Stage 4: group by hour (async* — push-based with backpressure) ──\nStream\u003CMapEntry\u003CDateTime, List\u003CLogEntry>>> groupByHour(\n Stream\u003CLogEntry> entries,\n) async* {\n var currentHour = \u003CDateTime, List\u003CLogEntry>>{};\n LogEntry? last;\n\n await for (final entry in entries) {\n final hour = DateTime(\n entry.timestamp.year,\n entry.timestamp.month,\n entry.timestamp.day,\n entry.timestamp.hour,\n );\n currentHour.putIfAbsent(hour, () => []).add(entry);\n last = entry;\n }\n for (final entry in currentHour.entries) {\n yield entry;\n }\n}\n\n\u002F\u002F ── Stage 5: aggregate — count errors per hour ──\nFuture\u003CMap\u003CDateTime, int>> errorCountPerHour(String logPath) async {\n final lines = readLines(logPath); \u002F\u002F lazy stream\n final entries = parseEntries(lines); \u002F\u002F lazy iterable\n final errors = filterByLevel(entries, 'ERROR'); \u002F\u002F lazy filter\n\n \u002F\u002F Convert to stream for async grouping:\n final grouped = groupByHour(Stream.fromIterable(errors));\n\n final result = \u003CDateTime, int>{};\n await for (final hourEntries in grouped) {\n result[hourEntries.key] = hourEntries.value.length;\n }\n return result;\n}\n\n\u002F\u002F ── Usage — the pipeline processes a 1GB log file with constant memory ──\nvoid main() async {\n final counts = await errorCountPerHour('app.log');\n for (final entry in counts.entries) {\n print('${entry.key}: ${entry.value} errors');\n }\n}\n",[23,1778,1779,1788,1797,1805,1809,1814,1819,1824,1828,1837,1847,1856,1864,1887,1891,1926,1951,1967,1982,1987,1991,1995,2000,2022,2032,2042,2052,2069,2073,2077,2082,2112,2128,2135,2170,2182,2187,2194,2198,2202,2206,2210,2215,2244,2267,2271,2275,2280,2310,2322,2330,2361,2372,2376,2396,2409,2414,2419,2424,2429,2433,2455,2465,2469,2484,2491,2495,2499,2503,2508,2543,2561,2579,2603,2607,2612,2636,2640,2660,2678,2688,2692,2699,2703,2707,2712,2724,2746,2761,2798,2802],{"__ignoreMap":36},[40,1780,1781,1783,1786],{"class":42,"line":43},[40,1782,47],{"class":46},[40,1784,1785],{"class":50}," 'dart:async'",[40,1787,55],{"class":54},[40,1789,1790,1792,1795],{"class":42,"line":58},[40,1791,47],{"class":46},[40,1793,1794],{"class":50}," 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",[40,1883,213],{"class":88},[40,1885,1886],{"class":54},".message);\n",[40,1888,1889],{"class":42,"line":193},[40,1890,72],{"emptyLinePlaceholder":71},[40,1892,1893,1896,1898,1900,1903,1905,1908,1910,1912,1914,1917,1920,1922,1924],{"class":42,"line":203},[40,1894,1895],{"class":46}," factory",[40,1897,1834],{"class":88},[40,1899,1053],{"class":54},[40,1901,1902],{"class":120},"fromJson",[40,1904,124],{"class":54},[40,1906,1907],{"class":88},"Map",[40,1909,736],{"class":54},[40,1911,459],{"class":88},[40,1913,130],{"class":54},[40,1915,1916],{"class":88},"dynamic",[40,1918,1919],{"class":54},"> json) ",[40,1921,252],{"class":46},[40,1923,1834],{"class":88},[40,1925,878],{"class":54},[40,1927,1928,1931,1933,1935,1938,1941,1944,1947,1949],{"class":42,"line":224},[40,1929,1930],{"class":88}," DateTime",[40,1932,1053],{"class":54},[40,1934,782],{"class":120},[40,1936,1937],{"class":54},"(json[",[40,1939,1940],{"class":50},"'timestamp'",[40,1942,1943],{"class":54},"] ",[40,1945,1946],{"class":46},"as",[40,1948,187],{"class":88},[40,1950,136],{"class":54},[40,1952,1953,1956,1959,1961,1963,1965],{"class":42,"line":229},[40,1954,1955],{"class":54}," json[",[40,1957,1958],{"class":50},"'level'",[40,1960,1943],{"class":54},[40,1962,1946],{"class":46},[40,1964,187],{"class":88},[40,1966,314],{"class":54},[40,1968,1969,1971,1974,1976,1978,1980],{"class":42,"line":235},[40,1970,1955],{"class":54},[40,1972,1973],{"class":50},"'message'",[40,1975,1943],{"class":54},[40,1977,1946],{"class":46},[40,1979,187],{"class":88},[40,1981,314],{"class":54},[40,1983,1984],{"class":42,"line":266},[40,1985,1986],{"class":54}," );\n",[40,1988,1989],{"class":42,"line":280},[40,1990,623],{"class":54},[40,1992,1993],{"class":42,"line":317},[40,1994,72],{"emptyLinePlaceholder":71},[40,1996,1997],{"class":42,"line":337},[40,1998,1999],{"class":78},"\u002F\u002F ── Stage 1: read lines lazily (streaming — constant memory) ──\n",[40,2001,2002,2005,2007,2009,2012,2015,2017,2019],{"class":42,"line":343},[40,2003,2004],{"class":88},"Stream",[40,2006,736],{"class":54},[40,2008,459],{"class":88},[40,2010,2011],{"class":54},"> ",[40,2013,2014],{"class":120},"readLines",[40,2016,124],{"class":54},[40,2018,459],{"class":88},[40,2020,2021],{"class":54}," path) {\n",[40,2023,2024,2026,2029],{"class":42,"line":348},[40,2025,652],{"class":46},[40,2027,2028],{"class":88}," File",[40,2030,2031],{"class":54},"(path)\n",[40,2033,2034,2037,2040],{"class":42,"line":354},[40,2035,2036],{"class":54}," .",[40,2038,2039],{"class":120},"openRead",[40,2041,658],{"class":54},[40,2043,2044,2046,2049],{"class":42,"line":379},[40,2045,2036],{"class":54},[40,2047,2048],{"class":120},"transform",[40,2050,2051],{"class":54},"(utf8.decoder)\n",[40,2053,2054,2056,2058,2060,2063,2066],{"class":42,"line":391},[40,2055,2036],{"class":54},[40,2057,2048],{"class":120},[40,2059,124],{"class":54},[40,2061,2062],{"class":46},"const",[40,2064,2065],{"class":88}," LineSplitter",[40,2067,2068],{"class":54},"());\n",[40,2070,2071],{"class":42,"line":418},[40,2072,623],{"class":54},[40,2074,2075],{"class":42,"line":436},[40,2076,72],{"emptyLinePlaceholder":71},[40,2078,2079],{"class":42,"line":441},[40,2080,2081],{"class":78},"\u002F\u002F ── Stage 2: parse JSON lazily (sync* — pull-based) ──\n",[40,2083,2084,2086,2088,2091,2093,2096,2098,2100,2102,2104,2107,2110],{"class":42,"line":446},[40,2085,1766],{"class":88},[40,2087,736],{"class":54},[40,2089,2090],{"class":88},"LogEntry",[40,2092,2011],{"class":54},[40,2094,2095],{"class":120},"parseEntries",[40,2097,124],{"class":54},[40,2099,1766],{"class":88},[40,2101,736],{"class":54},[40,2103,459],{"class":88},[40,2105,2106],{"class":54},"> lines) ",[40,2108,2109],{"class":46},"sync*",[40,2111,114],{"class":54},[40,2113,2114,2116,2118,2120,2123,2125],{"class":42,"line":478},[40,2115,1498],{"class":46},[40,2117,258],{"class":54},[40,2119,1503],{"class":46},[40,2121,2122],{"class":54}," line ",[40,2124,1509],{"class":46},[40,2126,2127],{"class":54}," lines) {\n",[40,2129,2130,2133],{"class":42,"line":498},[40,2131,2132],{"class":46}," try",[40,2134,114],{"class":54},[40,2136,2137,2140,2142,2144,2146,2148,2151,2154,2156,2159,2161,2163,2165,2167],{"class":42,"line":516},[40,2138,2139],{"class":46}," yield",[40,2141,1834],{"class":88},[40,2143,1053],{"class":54},[40,2145,1902],{"class":120},[40,2147,124],{"class":54},[40,2149,2150],{"class":120},"jsonDecode",[40,2152,2153],{"class":54},"(line) ",[40,2155,1946],{"class":46},[40,2157,2158],{"class":88}," Map",[40,2160,736],{"class":54},[40,2162,459],{"class":88},[40,2164,130],{"class":54},[40,2166,1916],{"class":88},[40,2168,2169],{"class":54},">);\n",[40,2171,2172,2175,2177,2180],{"class":42,"line":534},[40,2173,2174],{"class":54}," } ",[40,2176,1022],{"class":46},[40,2178,2179],{"class":88}," FormatException",[40,2181,114],{"class":54},[40,2183,2184],{"class":42,"line":569},[40,2185,2186],{"class":78}," \u002F\u002F skip invalid lines (don't crash on bad data)\n",[40,2188,2189,2192],{"class":42,"line":574},[40,2190,2191],{"class":46}," continue",[40,2193,55],{"class":54},[40,2195,2196],{"class":42,"line":579},[40,2197,852],{"class":54},[40,2199,2200],{"class":42,"line":603},[40,2201,1144],{"class":54},[40,2203,2204],{"class":42,"line":620},[40,2205,623],{"class":54},[40,2207,2208],{"class":42,"line":626},[40,2209,72],{"emptyLinePlaceholder":71},[40,2211,2212],{"class":42,"line":631},[40,2213,2214],{"class":78},"\u002F\u002F ── Stage 3: filter by level (lazy Iterable) ──\n",[40,2216,2217,2219,2221,2223,2225,2228,2230,2232,2234,2236,2239,2241],{"class":42,"line":637},[40,2218,1766],{"class":88},[40,2220,736],{"class":54},[40,2222,2090],{"class":88},[40,2224,2011],{"class":54},[40,2226,2227],{"class":120},"filterByLevel",[40,2229,124],{"class":54},[40,2231,1766],{"class":88},[40,2233,736],{"class":54},[40,2235,2090],{"class":88},[40,2237,2238],{"class":54},"> entries, ",[40,2240,459],{"class":88},[40,2242,2243],{"class":54}," level) {\n",[40,2245,2246,2248,2251,2254,2257,2259,2262,2264],{"class":42,"line":649},[40,2247,652],{"class":46},[40,2249,2250],{"class":54}," entries.",[40,2252,2253],{"class":120},"where",[40,2255,2256],{"class":54},"((e) ",[40,2258,252],{"class":46},[40,2260,2261],{"class":54}," e.level ",[40,2263,815],{"class":46},[40,2265,2266],{"class":54}," level);\n",[40,2268,2269],{"class":42,"line":661},[40,2270,623],{"class":54},[40,2272,2273],{"class":42,"line":678},[40,2274,72],{"emptyLinePlaceholder":71},[40,2276,2277],{"class":42,"line":692},[40,2278,2279],{"class":78},"\u002F\u002F ── Stage 4: group by hour (async* — push-based with backpressure) ──\n",[40,2281,2282,2284,2286,2289,2291,2294,2296,2298,2300,2302,2305,2308],{"class":42,"line":706},[40,2283,2004],{"class":88},[40,2285,736],{"class":54},[40,2287,2288],{"class":88},"MapEntry",[40,2290,736],{"class":54},[40,2292,2293],{"class":88},"DateTime",[40,2295,130],{"class":54},[40,2297,733],{"class":88},[40,2299,736],{"class":54},[40,2301,2090],{"class":88},[40,2303,2304],{"class":54},">>> ",[40,2306,2307],{"class":120},"groupByHour",[40,2309,878],{"class":54},[40,2311,2312,2315,2317,2319],{"class":42,"line":711},[40,2313,2314],{"class":88}," Stream",[40,2316,736],{"class":54},[40,2318,2090],{"class":88},[40,2320,2321],{"class":54},"> entries,\n",[40,2323,2324,2326,2328],{"class":42,"line":716},[40,2325,299],{"class":54},[40,2327,1770],{"class":46},[40,2329,114],{"class":54},[40,2331,2332,2335,2338,2340,2343,2345,2347,2349,2351,2353,2356,2358],{"class":42,"line":722},[40,2333,2334],{"class":46}," var",[40,2336,2337],{"class":54}," currentHour ",[40,2339,761],{"class":46},[40,2341,2342],{"class":46}," \u003C",[40,2344,2293],{"class":88},[40,2346,130],{"class":54},[40,2348,733],{"class":88},[40,2350,736],{"class":54},[40,2352,2090],{"class":88},[40,2354,2355],{"class":54},">",[40,2357,2355],{"class":46},[40,2359,2360],{"class":54},"{};\n",[40,2362,2363,2366,2369],{"class":42,"line":744},[40,2364,2365],{"class":88}," LogEntry",[40,2367,2368],{"class":46},"?",[40,2370,2371],{"class":54}," last;\n",[40,2373,2374],{"class":42,"line":752},[40,2375,72],{"emptyLinePlaceholder":71},[40,2377,2378,2381,2384,2386,2388,2391,2393],{"class":42,"line":769},[40,2379,2380],{"class":46}," await",[40,2382,2383],{"class":46}," for",[40,2385,258],{"class":54},[40,2387,1503],{"class":46},[40,2389,2390],{"class":54}," entry ",[40,2392,1509],{"class":46},[40,2394,2395],{"class":54}," entries) {\n",[40,2397,2398,2400,2403,2405,2407],{"class":42,"line":788},[40,2399,755],{"class":46},[40,2401,2402],{"class":54}," hour 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──\n",[40,2509,2510,2513,2515,2517,2519,2521,2523,2525,2528,2531,2533,2535,2538,2541],{"class":42,"line":985},[40,2511,2512],{"class":88},"Future",[40,2514,736],{"class":54},[40,2516,1907],{"class":88},[40,2518,736],{"class":54},[40,2520,2293],{"class":88},[40,2522,130],{"class":54},[40,2524,1160],{"class":88},[40,2526,2527],{"class":54},">> ",[40,2529,2530],{"class":120},"errorCountPerHour",[40,2532,124],{"class":54},[40,2534,459],{"class":88},[40,2536,2537],{"class":54}," logPath) ",[40,2539,2540],{"class":46},"async",[40,2542,114],{"class":54},[40,2544,2545,2547,2550,2552,2555,2558],{"class":42,"line":1001},[40,2546,184],{"class":46},[40,2548,2549],{"class":54}," lines ",[40,2551,761],{"class":46},[40,2553,2554],{"class":120}," readLines",[40,2556,2557],{"class":54},"(logPath); ",[40,2559,2560],{"class":78},"\u002F\u002F lazy stream\n",[40,2562,2563,2565,2568,2570,2573,2576],{"class":42,"line":1007},[40,2564,184],{"class":46},[40,2566,2567],{"class":54}," entries 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parallel processing ──\nclass ImageProcessor {\n final int _poolSize;\n final List\u003C_ImageWorker> _workers = [];\n final _available = \u003C_ImageWorker>[];\n final _pending = \u003CCompleter\u003CUint8List>, _ImageWorker>{};\n final _queue = \u003C(ImageTask, Completer\u003CUint8List>)>[];\n\n ImageProcessor(this._poolSize);\n\n Future\u003Cvoid> start() async {\n for (var i = 0; i \u003C _poolSize; i++) {\n final worker = await _ImageWorker.spawn();\n worker.onResult = _handleResult;\n _workers.add(worker);\n _available.add(worker);\n }\n }\n\n Future\u003CUint8List> process(Uint8List pixels, int w, int h, String op) {\n final completer = Completer\u003CUint8List>();\n final task = ImageTask(\n _queue.length,\n TransferableTypedData.fromList([pixels]), \u002F\u002F wrap for zero-copy\n w, h, op,\n );\n _queue.add((task, completer));\n _processQueue();\n return completer.future;\n }\n\n void _processQueue() {\n while (_available.isNotEmpty && _queue.isNotEmpty) {\n final worker = _available.removeLast();\n final (task, completer) = _queue.removeAt(0);\n _pending[completer] = worker;\n worker.process(task, completer);\n }\n }\n\n void _handleResult(_ImageWorker worker) {\n _available.add(worker);\n _processQueue();\n }\n\n void dispose() {\n for (var w in _workers) w.kill();\n }\n}\n\nclass _ImageWorker {\n late final Isolate _isolate;\n late final SendPort _sendPort;\n final _receivePort = ReceivePort();\n late void Function(_ImageWorker) onResult;\n Completer\u003CUint8List>? _current;\n\n static Future\u003C_ImageWorker> spawn() async {\n final worker = _ImageWorker();\n worker._isolate = await Isolate.spawn(_entry, worker._receivePort.sendPort);\n worker._sendPort = await worker._receivePort.first as SendPort;\n worker._receivePort.listen(worker._handleMessage);\n return worker;\n }\n\n void process(ImageTask task, Completer\u003CUint8List> completer) {\n _current = completer;\n _sendPort.send(task);\n }\n\n void _handleMessage(dynamic message) {\n if 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pixels[i];\n",[40,4403,4405,4407,4409,4411,4413,4415,4417,4419,4421,4423,4425],{"class":42,"line":4404},139,[40,4406,4258],{"class":54},[40,4408,429],{"class":46},[40,4410,4212],{"class":88},[40,4412,1943],{"class":54},[40,4414,761],{"class":46},[40,4416,4395],{"class":88},[40,4418,4398],{"class":46},[40,4420,4207],{"class":54},[40,4422,429],{"class":46},[40,4424,4212],{"class":88},[40,4426,4427],{"class":54},"];\n",[40,4429,4431,4433,4435,4437,4439,4441,4443,4445,4447,4449,4451],{"class":42,"line":4430},140,[40,4432,4258],{"class":54},[40,4434,429],{"class":46},[40,4436,4228],{"class":88},[40,4438,1943],{"class":54},[40,4440,761],{"class":46},[40,4442,4395],{"class":88},[40,4444,4398],{"class":46},[40,4446,4207],{"class":54},[40,4448,429],{"class":46},[40,4450,4228],{"class":88},[40,4452,4427],{"class":54},[40,4454,4456,4458,4460,4462,4464,4466,4468,4470,4472],{"class":42,"line":4455},141,[40,4457,4258],{"class":54},[40,4459,429],{"class":46},[40,4461,1185],{"class":88},[40,4463,1943],{"class":54},[40,4465,761],{"class":46},[40,4467,4207],{"class":54},[40,4469,429],{"class":46},[40,4471,1185],{"class":88},[40,4473,4427],{"class":54},[40,4475,4477],{"class":42,"line":4476},142,[40,4478,852],{"class":54},[40,4480,4482,4484],{"class":42,"line":4481},143,[40,4483,3333],{"class":46},[40,4485,2698],{"class":54},[40,4487,4489],{"class":42,"line":4488},144,[40,4490,1144],{"class":54},[40,4492,4494],{"class":42,"line":4493},145,[40,4495,623],{"class":54},[14,4497,4499],{"id":4498},"project-4-full-stack-capstone-flutter-dart_frog-shared-models","Project 4 — Full-Stack Capstone (Flutter + dart_frog + Shared Models)",[19,4501,4502],{},"A production full-stack app with shared data models, a REST API, and a Flutter client. Demonstrates monorepo structure, shared packages, and end-to-end types.",[28,4504,4506],{"language":4505},"text",[32,4507,4511],{"className":4508,"code":4510,"language":4505,"meta":36},[4509],"language-text","capstone\u002F\n├── packages\u002F\n│ └── models\u002F # shared data models (freezed + json_serializable)\n│ ├── lib\u002F\n│ │ ├── models.dart # public API barrel\n│ │ └── src\u002F\n│ │ ├── task.dart\n│ │ └── user.dart\n│ ├── pubspec.yaml\n│ └── analysis_options.yaml\n├── server\u002F # dart_frog REST API\n│ ├── routes\u002F\n│ │ ├── index.dart\n│ │ ├── tasks\u002F\n│ │ │ ├── index.dart\n│ │ │ └── [id].dart\n│ │ └── _middleware.dart\n│ ├── lib\u002F\n│ │ └── db.dart # database layer\n│ ├── test\u002F\n│ │ └── tasks_test.dart\n│ ├── pubspec.yaml\n│ └── Dockerfile\n├── client\u002F # Flutter app\n│ ├── lib\u002F\n│ │ ├── main.dart\n│ │ ├── api\u002F\n│ │ │ └── api_client.dart\n│ │ ├── state\u002F\n│ │ │ └── task_provider.dart\n│ │ └── screens\u002F\n│ │ ├── task_list_screen.dart\n│ │ └── task_detail_screen.dart\n│ ├── pubspec.yaml\n│ └── analysis_options.yaml\n└── melos.yaml # monorepo management\n",[23,4512,4510],{"__ignoreMap":36},[4514,4515,4517],"h3",{"id":4516},"shared-models-package","Shared Models Package",[28,4519,4520],{"language":30},[32,4521,4523],{"className":34,"code":4522,"language":30,"meta":36,"style":36},"\u002F\u002F packages\u002Fmodels\u002Flib\u002Fsrc\u002Ftask.dart\nimport 'package:freezed_annotation\u002Ffreezed_annotation.dart';\npart 'task.freezed.dart';\npart 'task.g.dart';\n\n@freezed\nclass Task with _$Task {\n const factory Task({\n required String id,\n required String title,\n required String description,\n @Default(false) bool completed,\n required DateTime createdAt,\n DateTime? completedAt,\n }) = _Task;\n\n factory Task.fromJson(Map\u003CString, dynamic> json) => _$TaskFromJson(json);\n}\n\n\u002F\u002F packages\u002Fmodels\u002Flib\u002Fmodels.dart — barrel file\nexport 'src\u002Ftask.dart';\nexport 'src\u002Fuser.dart';\n",[23,4524,4525,4530,4539,4549,4558,4562,4567,4582,4594,4604,4613,4622,4640,4649,4658,4670,4674,4706,4710,4714,4719,4729],{"__ignoreMap":36},[40,4526,4527],{"class":42,"line":43},[40,4528,4529],{"class":78},"\u002F\u002F packages\u002Fmodels\u002Flib\u002Fsrc\u002Ftask.dart\n",[40,4531,4532,4534,4537],{"class":42,"line":58},[40,4533,47],{"class":46},[40,4535,4536],{"class":50}," 'package:freezed_annotation\u002Ffreezed_annotation.dart'",[40,4538,55],{"class":54},[40,4540,4541,4544,4547],{"class":42,"line":68},[40,4542,4543],{"class":46},"part",[40,4545,4546],{"class":50}," 'task.freezed.dart'",[40,4548,55],{"class":54},[40,4550,4551,4553,4556],{"class":42,"line":75},[40,4552,4543],{"class":46},[40,4554,4555],{"class":50}," 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file\n",[40,4720,4721,4724,4727],{"class":42,"line":317},[40,4722,4723],{"class":46},"export",[40,4725,4726],{"class":50}," 'src\u002Ftask.dart'",[40,4728,55],{"class":54},[40,4730,4731,4733,4736],{"class":42,"line":337},[40,4732,4723],{"class":46},[40,4734,4735],{"class":50}," 'src\u002Fuser.dart'",[40,4737,55],{"class":54},[4514,4739,4741],{"id":4740},"server-dart_frog-rest-api","Server — dart_frog REST API",[28,4743,4744,5211,5825,5829],{"language":30},[32,4745,4747],{"className":34,"code":4746,"language":30,"meta":36,"style":36},"\u002F\u002F server\u002Froutes\u002Ftasks\u002Findex.dart\nimport 'package:dart_frog\u002Fdart_frog.dart';\nimport 'package:models\u002Fmodels.dart';\nimport '..\u002F..\u002Flib\u002Fdb.dart';\n\nFuture\u003CResponse> onRequest(RequestContext context) async {\n final db = context.read\u003CTaskDatabase>();\n\n return switch (context.request.method) {\n HttpMethod.get => Response.json(body: await db.all()),\n HttpMethod.post => _createTask(context, db),\n _ => Response(statusCode: HttpStatus.methodNotAllowed),\n };\n}\n\nFuture\u003CResponse> _createTask(RequestContext context, TaskDatabase db) async {\n final body = await context.request.json() as Map\u003CString, dynamic>;\n final title = body['title'] as String?;\n if (title == null || title.isEmpty) {\n return Response(statusCode: 400, body: 'Title is required');\n }\n final task = Task(\n id: _generateId(),\n title: title,\n description: body['description'] as String? ?? 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'http:\u002F\u002Flocalhost:8080'",[40,6526,173],{"class":54},[40,6528,6529],{"class":42,"line":106},[40,6530,6531],{"class":54},"});\n",[40,6533,6534],{"class":42,"line":117},[40,6535,72],{"emptyLinePlaceholder":71},[40,6537,6538,6540,6543,6545,6548,6550,6552,6554,6556,6559,6561],{"class":42,"line":139},[40,6539,1503],{"class":46},[40,6541,6542],{"class":54}," taskListProvider ",[40,6544,761],{"class":46},[40,6546,6547],{"class":88}," FutureProvider",[40,6549,736],{"class":54},[40,6551,733],{"class":88},[40,6553,736],{"class":54},[40,6555,5971],{"class":88},[40,6557,6558],{"class":54},">>((ref) ",[40,6560,2540],{"class":46},[40,6562,114],{"class":54},[40,6564,6565,6567,6570,6572,6575,6577],{"class":42,"line":157},[40,6566,652],{"class":46},[40,6568,6569],{"class":54}," ref.",[40,6571,4825],{"class":120},[40,6573,6574],{"class":54},"(apiClientProvider).",[40,6576,5976],{"class":120},[40,6578,766],{"class":54},[40,6580,6581],{"class":42,"line":176},[40,6582,6531],{"class":54},[40,6584,6585],{"class":42,"line":181},[40,6586,72],{"emptyLinePlaceholder":71},[40,6588,6589,6591,6594,6596,6598,6600,6603],{"class":42,"line":193},[40,6590,1503],{"class":46},[40,6592,6593],{"class":54}," taskActionsProvider ",[40,6595,761],{"class":46},[40,6597,6502],{"class":88},[40,6599,736],{"class":54},[40,6601,6602],{"class":88},"TaskActions",[40,6604,6510],{"class":54},[40,6606,6607,6609,6612,6615,6617],{"class":42,"line":203},[40,6608,652],{"class":46},[40,6610,6611],{"class":88}," TaskActions",[40,6613,6614],{"class":54},"(ref.",[40,6616,4825],{"class":120},[40,6618,6619],{"class":54},"(apiClientProvider), ref);\n",[40,6621,6622],{"class":42,"line":224},[40,6623,6531],{"class":54},[40,6625,6626],{"class":42,"line":229},[40,6627,72],{"emptyLinePlaceholder":71},[40,6629,6630,6632,6634],{"class":42,"line":235},[40,6631,1681],{"class":46},[40,6633,6611],{"class":88},[40,6635,114],{"class":54},[40,6637,6638,6640,6642],{"class":42,"line":266},[40,6639,184],{"class":46},[40,6641,5880],{"class":88},[40,6643,6644],{"class":54}," api;\n",[40,6646,6647,6649,6652],{"class":42,"line":280},[40,6648,184],{"class":46},[40,6650,6651],{"class":88}," Ref",[40,6653,6654],{"class":54}," ref;\n",[40,6656,6657,6660,6662,6664,6667,6669],{"class":42,"line":317},[40,6658,6659],{"class":88}," TaskActions",[40,6661,124],{"class":54},[40,6663,213],{"class":88},[40,6665,6666],{"class":54},".api, ",[40,6668,213],{"class":88},[40,6670,6671],{"class":54},".ref);\n",[40,6673,6674],{"class":42,"line":337},[40,6675,72],{"emptyLinePlaceholder":71},[40,6677,6678,6680,6682,6684,6686,6689,6691,6693,6695,6697,6699,6701],{"class":42,"line":343},[40,6679,3106],{"class":88},[40,6681,736],{"class":54},[40,6683,725],{"class":46},[40,6685,2011],{"class":54},[40,6687,6688],{"class":120},"create",[40,6690,124],{"class":54},[40,6692,459],{"class":88},[40,6694,6137],{"class":54},[40,6696,459],{"class":88},[40,6698,6142],{"class":54},[40,6700,2540],{"class":46},[40,6702,114],{"class":54},[40,6704,6705,6708,6711,6713],{"class":42,"line":348},[40,6706,6707],{"class":46}," await",[40,6709,6710],{"class":54}," api.",[40,6712,6130],{"class":120},[40,6714,6715],{"class":54},"(title, description);\n",[40,6717,6718,6721,6724,6727],{"class":42,"line":354},[40,6719,6720],{"class":54}," ref.",[40,6722,6723],{"class":120},"invalidate",[40,6725,6726],{"class":54},"(taskListProvider); ",[40,6728,6729],{"class":78},"\u002F\u002F refresh the list\n",[40,6731,6732],{"class":42,"line":379},[40,6733,1144],{"class":54},[40,6735,6736],{"class":42,"line":391},[40,6737,72],{"emptyLinePlaceholder":71},[40,6739,6740,6742,6744,6746,6748,6750,6752,6754,6756,6758],{"class":42,"line":418},[40,6741,3106],{"class":88},[40,6743,736],{"class":54},[40,6745,725],{"class":46},[40,6747,2011],{"class":54},[40,6749,5780],{"class":120},[40,6751,124],{"class":54},[40,6753,459],{"class":88},[40,6755,5273],{"class":54},[40,6757,2540],{"class":46},[40,6759,114],{"class":54},[40,6761,6762,6764,6766,6768],{"class":42,"line":436},[40,6763,6707],{"class":46},[40,6765,6710],{"class":54},[40,6767,6303],{"class":120},[40,6769,5426],{"class":54},[40,6771,6772,6774,6776],{"class":42,"line":441},[40,6773,6720],{"class":54},[40,6775,6723],{"class":120},[40,6777,6778],{"class":54},"(taskListProvider);\n",[40,6780,6781],{"class":42,"line":446},[40,6782,1144],{"class":54},[40,6784,6785],{"class":42,"line":478},[40,6786,623],{"class":54},[14,6788,6790],{"id":6789},"production-checklist","Production Checklist",[28,6792,6794],{"language":6793},"markdown",[32,6795,6798],{"className":6796,"code":6797,"language":6793,"meta":36,"style":36},"language-markdown shiki shiki-themes github-light github-dark","## Null Safety & Types\n- [ ] Sound null safety (no `!` abuse, proper `?`\u002F`??`\u002F`?.`)\n- [ ] `Object?` over `dynamic` for \"any value\" (preserve type checking)\n- [ ] `late final x = initializer` for lazy fields (not bare `late`)\n\n## Control Flow & Patterns\n- [ ] Exhaustive switches (no `default`\u002F`_` for enums\u002Fsealed types)\n- [ ] Pattern matching with destructuring (no manual casts)\n- [ ] `assert` only for debug invariants (stripped in AOT)\n\n## Error Handling\n- [ ] Specific `on Type catch` (not broad `catch (e)`)\n- [ ] `rethrow` (not `throw e`) to preserve stack traces\n- [ ] `Exception` subtypes for recoverable, `Error` subtypes for bugs\n- [ ] `runZonedGuarded` for uncaught async errors\n\n## Async & Concurrency\n- [ ] `async`\u002F`await` (no unawaited futures — use `unawaited()`)\n- [ ] `Future.wait` for parallel independent operations\n- [ ] `mounted` check after `await` (before `setState`\u002F`context`)\n- [ ] `TransferableTypedData` for large buffers between isolates\n- [ ] Isolates for CPU-heavy, `await` for I\u002FO\n\n## Classes & Generics\n- [ ] `sealed` for closed hierarchies (exhaustive switches)\n- [ ] `const` constructors for immutable value types\n- [ ] `==`\u002F`hashCode` override for value classes (or use records)\n- [ ] `is T` (not `as T`) for generic cache retrieval\n\n## Collections\n- [ ] `fold` (not `reduce`) for possibly-empty collections\n- [ ] `[...list]..sort()` for sorted copies (sort is in-place, void)\n- [ ] Chain lazy `Iterable` ops, `.toList()` once at the end\n- [ ] `List.unmodifiable([...source])` for immutable copies\n\n## Security\n- [ ] Parameterized SQL queries (never string interpolation)\n- [ ] Input validation (server-side, before processing)\n- [ ] No secrets in code (use env vars \u002F secret managers)\n\n## Cross-Platform\n- [ ] `dart:io` not used on web (conditional imports)\n- [ ] `BigInt` for large integers on web (int precision above 2^53)\n- [ ] `http` package for cross-platform HTTP\n\n## Flutter\n- [ ] `const` widgets where possible (canonicalization, zero rebuild)\n- [ ] `build()` is pure (no side effects, no setState)\n- [ ] `initState` for async work, `mounted` check before setState\n- [ ] `ListView.builder` for long lists (lazy building)\n- [ ] `ValueKey` for items that can reorder\n\n## Tooling & CI\n- [ ] `dart format` applied (CI: `--set-exit-if-changed`)\n- [ ] `dart analyze` clean (CI: `--fatal-infos`)\n- [ ] `dart test` in CI (tests for all logic)\n- [ ] `build_runner` generated files not edited (regenerate from source)\n- [ ] `pubspec.lock` committed for apps (reproducible builds)\n",[23,6799,6800,6806,6836,6855,6872,6876,6881,6899,6906,6918,6922,6927,6945,6963,6981,6993,6997,7002,7024,7036,7063,7075,7087,7091,7096,7108,7120,7137,7154,7158,7163,7180,7192,7211,7223,7227,7232,7239,7246,7253,7257,7262,7274,7286,7298,7302,7307,7318,7330,7347,7359,7371,7375,7380,7397,7414,7426,7438],{"__ignoreMap":36},[40,6801,6802],{"class":42,"line":43},[40,6803,6805],{"class":6804},"sXvq9","## Null Safety & Types\n",[40,6807,6808,6811,6814,6817,6820,6823,6826,6829,6831,6834],{"class":42,"line":58},[40,6809,293],{"class":6810},"sCrzJ",[40,6812,6813],{"class":54}," [ ] Sound null safety (no ",[40,6815,6816],{"class":88},"`!`",[40,6818,6819],{"class":54}," abuse, proper ",[40,6821,6822],{"class":88},"`?`",[40,6824,6825],{"class":54},"\u002F",[40,6827,6828],{"class":88},"`??`",[40,6830,6825],{"class":54},[40,6832,6833],{"class":88},"`?.`",[40,6835,675],{"class":54},[40,6837,6838,6840,6843,6846,6849,6852],{"class":42,"line":68},[40,6839,293],{"class":6810},[40,6841,6842],{"class":54}," [ ] ",[40,6844,6845],{"class":88},"`Object?`",[40,6847,6848],{"class":54}," over ",[40,6850,6851],{"class":88},"`dynamic`",[40,6853,6854],{"class":54}," for \"any value\" (preserve type checking)\n",[40,6856,6857,6859,6861,6864,6867,6870],{"class":42,"line":75},[40,6858,293],{"class":6810},[40,6860,6842],{"class":54},[40,6862,6863],{"class":88},"`late final x = initializer`",[40,6865,6866],{"class":54}," for lazy fields (not bare ",[40,6868,6869],{"class":88},"`late`",[40,6871,675],{"class":54},[40,6873,6874],{"class":42,"line":82},[40,6875,72],{"emptyLinePlaceholder":71},[40,6877,6878],{"class":42,"line":95},[40,6879,6880],{"class":6804},"## Control Flow & Patterns\n",[40,6882,6883,6885,6888,6891,6893,6896],{"class":42,"line":100},[40,6884,293],{"class":6810},[40,6886,6887],{"class":54}," [ ] Exhaustive switches (no ",[40,6889,6890],{"class":88},"`default`",[40,6892,6825],{"class":54},[40,6894,6895],{"class":88},"`_`",[40,6897,6898],{"class":54}," for enums\u002Fsealed types)\n",[40,6900,6901,6903],{"class":42,"line":106},[40,6902,293],{"class":6810},[40,6904,6905],{"class":54}," [ ] Pattern matching with destructuring (no manual casts)\n",[40,6907,6908,6910,6912,6915],{"class":42,"line":117},[40,6909,293],{"class":6810},[40,6911,6842],{"class":54},[40,6913,6914],{"class":88},"`assert`",[40,6916,6917],{"class":54}," only for debug invariants (stripped in AOT)\n",[40,6919,6920],{"class":42,"line":139},[40,6921,72],{"emptyLinePlaceholder":71},[40,6923,6924],{"class":42,"line":157},[40,6925,6926],{"class":6804},"## Error Handling\n",[40,6928,6929,6931,6934,6937,6940,6943],{"class":42,"line":176},[40,6930,293],{"class":6810},[40,6932,6933],{"class":54}," [ ] Specific ",[40,6935,6936],{"class":88},"`on Type catch`",[40,6938,6939],{"class":54}," (not broad ",[40,6941,6942],{"class":88},"`catch (e)`",[40,6944,675],{"class":54},[40,6946,6947,6949,6951,6954,6957,6960],{"class":42,"line":181},[40,6948,293],{"class":6810},[40,6950,6842],{"class":54},[40,6952,6953],{"class":88},"`rethrow`",[40,6955,6956],{"class":54}," (not ",[40,6958,6959],{"class":88},"`throw e`",[40,6961,6962],{"class":54},") to preserve stack traces\n",[40,6964,6965,6967,6969,6972,6975,6978],{"class":42,"line":193},[40,6966,293],{"class":6810},[40,6968,6842],{"class":54},[40,6970,6971],{"class":88},"`Exception`",[40,6973,6974],{"class":54}," subtypes for recoverable, ",[40,6976,6977],{"class":88},"`Error`",[40,6979,6980],{"class":54}," subtypes for bugs\n",[40,6982,6983,6985,6987,6990],{"class":42,"line":203},[40,6984,293],{"class":6810},[40,6986,6842],{"class":54},[40,6988,6989],{"class":88},"`runZonedGuarded`",[40,6991,6992],{"class":54}," for uncaught async errors\n",[40,6994,6995],{"class":42,"line":224},[40,6996,72],{"emptyLinePlaceholder":71},[40,6998,6999],{"class":42,"line":229},[40,7000,7001],{"class":6804},"## Async & Concurrency\n",[40,7003,7004,7006,7008,7011,7013,7016,7019,7022],{"class":42,"line":235},[40,7005,293],{"class":6810},[40,7007,6842],{"class":54},[40,7009,7010],{"class":88},"`async`",[40,7012,6825],{"class":54},[40,7014,7015],{"class":88},"`await`",[40,7017,7018],{"class":54}," (no unawaited futures — use ",[40,7020,7021],{"class":88},"`unawaited()`",[40,7023,675],{"class":54},[40,7025,7026,7028,7030,7033],{"class":42,"line":266},[40,7027,293],{"class":6810},[40,7029,6842],{"class":54},[40,7031,7032],{"class":88},"`Future.wait`",[40,7034,7035],{"class":54}," for parallel independent operations\n",[40,7037,7038,7040,7042,7045,7048,7050,7053,7056,7058,7061],{"class":42,"line":280},[40,7039,293],{"class":6810},[40,7041,6842],{"class":54},[40,7043,7044],{"class":88},"`mounted`",[40,7046,7047],{"class":54}," check after ",[40,7049,7015],{"class":88},[40,7051,7052],{"class":54}," (before ",[40,7054,7055],{"class":88},"`setState`",[40,7057,6825],{"class":54},[40,7059,7060],{"class":88},"`context`",[40,7062,675],{"class":54},[40,7064,7065,7067,7069,7072],{"class":42,"line":317},[40,7066,293],{"class":6810},[40,7068,6842],{"class":54},[40,7070,7071],{"class":88},"`TransferableTypedData`",[40,7073,7074],{"class":54}," for large buffers between isolates\n",[40,7076,7077,7079,7082,7084],{"class":42,"line":337},[40,7078,293],{"class":6810},[40,7080,7081],{"class":54}," [ ] Isolates for CPU-heavy, ",[40,7083,7015],{"class":88},[40,7085,7086],{"class":54}," for I\u002FO\n",[40,7088,7089],{"class":42,"line":343},[40,7090,72],{"emptyLinePlaceholder":71},[40,7092,7093],{"class":42,"line":348},[40,7094,7095],{"class":6804},"## Classes & Generics\n",[40,7097,7098,7100,7102,7105],{"class":42,"line":354},[40,7099,293],{"class":6810},[40,7101,6842],{"class":54},[40,7103,7104],{"class":88},"`sealed`",[40,7106,7107],{"class":54}," for closed hierarchies (exhaustive switches)\n",[40,7109,7110,7112,7114,7117],{"class":42,"line":379},[40,7111,293],{"class":6810},[40,7113,6842],{"class":54},[40,7115,7116],{"class":88},"`const`",[40,7118,7119],{"class":54}," constructors for immutable value types\n",[40,7121,7122,7124,7126,7129,7131,7134],{"class":42,"line":391},[40,7123,293],{"class":6810},[40,7125,6842],{"class":54},[40,7127,7128],{"class":88},"`==`",[40,7130,6825],{"class":54},[40,7132,7133],{"class":88},"`hashCode`",[40,7135,7136],{"class":54}," override for value classes (or use records)\n",[40,7138,7139,7141,7143,7146,7148,7151],{"class":42,"line":418},[40,7140,293],{"class":6810},[40,7142,6842],{"class":54},[40,7144,7145],{"class":88},"`is T`",[40,7147,6956],{"class":54},[40,7149,7150],{"class":88},"`as T`",[40,7152,7153],{"class":54},") for generic cache retrieval\n",[40,7155,7156],{"class":42,"line":436},[40,7157,72],{"emptyLinePlaceholder":71},[40,7159,7160],{"class":42,"line":441},[40,7161,7162],{"class":6804},"## Collections\n",[40,7164,7165,7167,7169,7172,7174,7177],{"class":42,"line":446},[40,7166,293],{"class":6810},[40,7168,6842],{"class":54},[40,7170,7171],{"class":88},"`fold`",[40,7173,6956],{"class":54},[40,7175,7176],{"class":88},"`reduce`",[40,7178,7179],{"class":54},") for possibly-empty collections\n",[40,7181,7182,7184,7186,7189],{"class":42,"line":478},[40,7183,293],{"class":6810},[40,7185,6842],{"class":54},[40,7187,7188],{"class":88},"`[...list]..sort()`",[40,7190,7191],{"class":54}," for sorted copies (sort is in-place, void)\n",[40,7193,7194,7196,7199,7202,7205,7208],{"class":42,"line":498},[40,7195,293],{"class":6810},[40,7197,7198],{"class":54}," [ ] Chain lazy ",[40,7200,7201],{"class":88},"`Iterable`",[40,7203,7204],{"class":54}," ops, ",[40,7206,7207],{"class":88},"`.toList()`",[40,7209,7210],{"class":54}," once at the end\n",[40,7212,7213,7215,7217,7220],{"class":42,"line":516},[40,7214,293],{"class":6810},[40,7216,6842],{"class":54},[40,7218,7219],{"class":88},"`List.unmodifiable([...source])`",[40,7221,7222],{"class":54}," for immutable copies\n",[40,7224,7225],{"class":42,"line":534},[40,7226,72],{"emptyLinePlaceholder":71},[40,7228,7229],{"class":42,"line":569},[40,7230,7231],{"class":6804},"## Security\n",[40,7233,7234,7236],{"class":42,"line":574},[40,7235,293],{"class":6810},[40,7237,7238],{"class":54}," [ ] Parameterized SQL queries (never string interpolation)\n",[40,7240,7241,7243],{"class":42,"line":579},[40,7242,293],{"class":6810},[40,7244,7245],{"class":54}," [ ] Input validation (server-side, before processing)\n",[40,7247,7248,7250],{"class":42,"line":603},[40,7249,293],{"class":6810},[40,7251,7252],{"class":54}," [ ] No secrets in code (use env vars \u002F secret managers)\n",[40,7254,7255],{"class":42,"line":620},[40,7256,72],{"emptyLinePlaceholder":71},[40,7258,7259],{"class":42,"line":626},[40,7260,7261],{"class":6804},"## Cross-Platform\n",[40,7263,7264,7266,7268,7271],{"class":42,"line":631},[40,7265,293],{"class":6810},[40,7267,6842],{"class":54},[40,7269,7270],{"class":88},"`dart:io`",[40,7272,7273],{"class":54}," not used on web (conditional imports)\n",[40,7275,7276,7278,7280,7283],{"class":42,"line":637},[40,7277,293],{"class":6810},[40,7279,6842],{"class":54},[40,7281,7282],{"class":88},"`BigInt`",[40,7284,7285],{"class":54}," for large integers on web (int precision above 2^53)\n",[40,7287,7288,7290,7292,7295],{"class":42,"line":649},[40,7289,293],{"class":6810},[40,7291,6842],{"class":54},[40,7293,7294],{"class":88},"`http`",[40,7296,7297],{"class":54}," package for cross-platform HTTP\n",[40,7299,7300],{"class":42,"line":661},[40,7301,72],{"emptyLinePlaceholder":71},[40,7303,7304],{"class":42,"line":678},[40,7305,7306],{"class":6804},"## Flutter\n",[40,7308,7309,7311,7313,7315],{"class":42,"line":692},[40,7310,293],{"class":6810},[40,7312,6842],{"class":54},[40,7314,7116],{"class":88},[40,7316,7317],{"class":54}," widgets where possible (canonicalization, zero rebuild)\n",[40,7319,7320,7322,7324,7327],{"class":42,"line":706},[40,7321,293],{"class":6810},[40,7323,6842],{"class":54},[40,7325,7326],{"class":88},"`build()`",[40,7328,7329],{"class":54}," is pure (no side effects, no setState)\n",[40,7331,7332,7334,7336,7339,7342,7344],{"class":42,"line":711},[40,7333,293],{"class":6810},[40,7335,6842],{"class":54},[40,7337,7338],{"class":88},"`initState`",[40,7340,7341],{"class":54}," for async work, ",[40,7343,7044],{"class":88},[40,7345,7346],{"class":54}," check before setState\n",[40,7348,7349,7351,7353,7356],{"class":42,"line":716},[40,7350,293],{"class":6810},[40,7352,6842],{"class":54},[40,7354,7355],{"class":88},"`ListView.builder`",[40,7357,7358],{"class":54}," for long lists (lazy building)\n",[40,7360,7361,7363,7365,7368],{"class":42,"line":722},[40,7362,293],{"class":6810},[40,7364,6842],{"class":54},[40,7366,7367],{"class":88},"`ValueKey`",[40,7369,7370],{"class":54}," for items that can reorder\n",[40,7372,7373],{"class":42,"line":744},[40,7374,72],{"emptyLinePlaceholder":71},[40,7376,7377],{"class":42,"line":752},[40,7378,7379],{"class":6804},"## Tooling & CI\n",[40,7381,7382,7384,7386,7389,7392,7395],{"class":42,"line":769},[40,7383,293],{"class":6810},[40,7385,6842],{"class":54},[40,7387,7388],{"class":88},"`dart format`",[40,7390,7391],{"class":54}," applied (CI: ",[40,7393,7394],{"class":88},"`--set-exit-if-changed`",[40,7396,675],{"class":54},[40,7398,7399,7401,7403,7406,7409,7412],{"class":42,"line":788},[40,7400,293],{"class":6810},[40,7402,6842],{"class":54},[40,7404,7405],{"class":88},"`dart analyze`",[40,7407,7408],{"class":54}," clean (CI: ",[40,7410,7411],{"class":88},"`--fatal-infos`",[40,7413,675],{"class":54},[40,7415,7416,7418,7420,7423],{"class":42,"line":793},[40,7417,293],{"class":6810},[40,7419,6842],{"class":54},[40,7421,7422],{"class":88},"`dart test`",[40,7424,7425],{"class":54}," in CI (tests for all logic)\n",[40,7427,7428,7430,7432,7435],{"class":42,"line":806},[40,7429,293],{"class":6810},[40,7431,6842],{"class":54},[40,7433,7434],{"class":88},"`build_runner`",[40,7436,7437],{"class":54}," generated files not edited (regenerate from source)\n",[40,7439,7440,7442,7444,7447],{"class":42,"line":823},[40,7441,293],{"class":6810},[40,7443,6842],{"class":54},[40,7445,7446],{"class":88},"`pubspec.lock`",[40,7448,7449],{"class":54}," committed for apps (reproducible builds)\n",[14,7451,7453],{"id":7452},"tips-tricks","💡 Tips & Tricks",[7455,7456,7457,7468,7491,7511,7519],"ul",{},[7458,7459,7460,7464,7465,7467],"li",{},[7461,7462,7463],"strong",{},"Performance",": use ",[23,7466,4008],{}," for large byte buffers between isolates — zero-copy transfer (O(1)) instead of deep copy (O(n)). The original buffer is invalidated after transfer. Use for images, audio, large arrays.",[7458,7469,7470,7473,7474,6825,7476,7478,7479,6825,7481,6825,7483,7486,7487,7490],{},[7461,7471,7472],{},"Idiom",": use lazy ",[23,7475,1766],{},[23,7477,2004],{}," pipelines — chain ",[23,7480,6076],{},[23,7482,2253],{},[23,7484,7485],{},"asyncMap"," and materialize once at the end. Processes data element-by-element with constant memory. Avoid intermediate ",[23,7488,7489],{},".toList()"," calls.",[7458,7492,7493,7495,7496,7499,7500,7503,7504,7507,7508,7510],{},[7461,7494,7472],{},": monorepo with shared models package — ",[23,7497,7498],{},"freezed"," + ",[23,7501,7502],{},"json_serializable"," models in ",[23,7505,7506],{},"packages\u002Fmodels\u002F",", imported by both server and client. End-to-end type safety — the server and client use the same ",[23,7509,5971],{}," type.",[7458,7512,7513,1539,7515,7518],{},[7461,7514,7472],{},[23,7516,7517],{},"dart compile exe"," for native server binaries — AOT-compiled, fast cold start, no runtime needed. Perfect for Docker containers. Cross-compile per-platform.",[7458,7520,7521,7464,7523,7526,7527,7530,7531,7534,7535,7499,7538,7541],{},[7461,7522,7472],{},[23,7524,7525],{},"melos"," for monorepo management — ",[23,7528,7529],{},"melos bootstrap"," installs deps for all packages, ",[23,7532,7533],{},"melos exec -- dart test"," runs tests across packages. Avoids manual ",[23,7536,7537],{},"cd",[23,7539,7540],{},"pub get"," for each package.",[14,7543,7545],{"id":7544},"️-edge-cases-gotchas","⚠️ Edge Cases & Gotchas",[7455,7547,7548,7564,7590,7609,7619,7627,7648,7658,7674],{},[7458,7549,7550,1539,7553,7556,7557,7559,7560,7563],{},[7461,7551,7552],{},"Monorepo path dependencies",[23,7554,7555],{},"shared_models: path: ..\u002Fshared_models"," — changes to the shared package require ",[23,7558,7529],{}," (or ",[23,7561,7562],{},"dart pub get"," in each consumer) to propagate.",[7458,7565,7566,7574,7575,7578,7579,7582,7583,7586,7587,1053],{},[7461,7567,7568,7570,7571],{},[23,7569,7498],{}," requires ",[23,7572,7573],{},"build_runner",": after changing a ",[23,7576,7577],{},"@freezed"," class, run ",[23,7580,7581],{},"dart run build_runner build"," to regenerate ",[23,7584,7585],{},".freezed.dart"," and ",[23,7588,7589],{},".g.dart",[7458,7591,7592,7598,7599,7601,7602,7604,7605,7608],{},[7461,7593,7594,7595,7597],{},"Web ",[23,7596,1160],{}," precision",": in the Flutter client, ",[23,7600,1160],{}," above 2^53 loses precision on web. If the server sends large IDs (e.g., snowflake IDs), use ",[23,7603,459],{}," or ",[23,7606,7607],{},"BigInt"," for the ID type.",[7458,7610,7611,7614,7615,7618],{},[7461,7612,7613],{},"CORS in development",": the Flutter web client needs CORS headers from the server. Use the ",[23,7616,7617],{},"corsMiddleware"," in shelf\u002Fdart_frog for development. In production, serve the client and API from the same origin (or configure CORS).",[7458,7620,7621,7626],{},[7461,7622,7623,7625],{},[23,7624,7517],{}," is platform-specific",": a macOS binary doesn't run on Linux. Build per-platform (use Docker for cross-compilation or CI runners per platform).",[7458,7628,7629,7632,7633,7636,7637,7559,7640,7643,7644,7647],{},[7461,7630,7631],{},"Async gaps in Flutter",": after ",[23,7634,7635],{},"await"," in a widget, check ",[23,7638,7639],{},"mounted",[23,7641,7642],{},"context.mounted",") before ",[23,7645,7646],{},"setState"," or navigation. The widget may have been disposed during the await.",[7458,7649,7650,7653,7654,7657],{},[7461,7651,7652],{},"Isolate spawn overhead (~50ms)",": for many small tasks, use a worker pool (reuse isolates). For one-shot heavy work, ",[23,7655,7656],{},"Isolate.run"," is fine.",[7458,7659,7660,7666,7667,7604,7670,7673],{},[7461,7661,7662,7665],{},[23,7663,7664],{},"Stream.toList()"," on infinite streams",": never completes. Use ",[23,7668,7669],{},".take(n).toList()",[23,7671,7672],{},".listen()"," for infinite streams.",[7458,7675,7676,7679,7680,6825,7682,7684,7685,7688,7689,7691],{},[7461,7677,7678],{},"Generated files and git",": either commit ",[23,7681,7589],{},[23,7683,7585],{}," (avoids build step for consumers) or ",[23,7686,7687],{},".gitignore"," them (cleaner diffs, but consumers must run ",[23,7690,7573],{},"). Be consistent.",[14,7693,7695],{"id":7694},"spot-the-bug","🧠 Spot the Bug",[19,7697,7698,7699,7701,7702,7705,7706,7709],{},"A full-stack app shares a ",[23,7700,5971],{}," model between server and client. The server returns ",[23,7703,7704],{},"created_at"," (snake_case), but the client model expects ",[23,7707,7708],{},"createdAt"," (camelCase):",[28,7711,7712],{"language":30},[32,7713,7715],{"className":34,"code":7714,"language":30,"meta":36,"style":36},"@freezed\nclass Task with _$Task {\n const factory Task({\n required String id,\n required String title,\n required DateTime createdAt, \u002F\u002F expects \"createdAt\" in JSON\n }) = _Task;\n\n factory Task.fromJson(Map\u003CString, dynamic> json) => _$TaskFromJson(json);\n}\n",[23,7716,7717,7721,7733,7743,7751,7759,7771,7781,7785,7815],{"__ignoreMap":36},[40,7718,7719],{"class":42,"line":43},[40,7720,4566],{"class":46},[40,7722,7723,7725,7727,7729,7731],{"class":42,"line":58},[40,7724,1681],{"class":46},[40,7726,4573],{"class":88},[40,7728,4576],{"class":46},[40,7730,4579],{"class":88},[40,7732,114],{"class":54},[40,7734,7735,7737,7739,7741],{"class":42,"line":68},[40,7736,206],{"class":46},[40,7738,4588],{"class":46},[40,7740,4573],{"class":88},[40,7742,4593],{"class":54},[40,7744,7745,7747,7749],{"class":42,"line":75},[40,7746,4598],{"class":46},[40,7748,187],{"class":88},[40,7750,4603],{"class":54},[40,7752,7753,7755,7757],{"class":42,"line":82},[40,7754,4598],{"class":46},[40,7756,187],{"class":88},[40,7758,4612],{"class":54},[40,7760,7761,7763,7765,7768],{"class":42,"line":95},[40,7762,4598],{"class":46},[40,7764,1843],{"class":88},[40,7766,7767],{"class":54}," createdAt, ",[40,7769,7770],{"class":78},"\u002F\u002F expects \"createdAt\" in JSON\n",[40,7772,7773,7775,7777,7779],{"class":42,"line":100},[40,7774,4662],{"class":54},[40,7776,761],{"class":46},[40,7778,4667],{"class":88},[40,7780,55],{"class":54},[40,7782,7783],{"class":42,"line":106},[40,7784,72],{"emptyLinePlaceholder":71},[40,7786,7787,7789,7791,7793,7795,7797,7799,7801,7803,7805,7807,7809,7811,7813],{"class":42,"line":117},[40,7788,1895],{"class":46},[40,7790,4573],{"class":88},[40,7792,1053],{"class":54},[40,7794,1902],{"class":120},[40,7796,124],{"class":54},[40,7798,1907],{"class":88},[40,7800,736],{"class":54},[40,7802,459],{"class":88},[40,7804,130],{"class":54},[40,7806,1916],{"class":88},[40,7808,1919],{"class":54},[40,7810,252],{"class":46},[40,7812,4702],{"class":88},[40,7814,4705],{"class":54},[40,7816,7817],{"class":42,"line":139},[40,7818,623],{"class":54},[19,7820,7821,7822,7825],{},"The server sends ",[23,7823,7824],{},"{\"id\": \"1\", \"title\": \"Test\", \"created_at\": \"2026-01-01T00:00:00\"}",". What happens?",[7827,7828,7829,7833,7860,7867,7986,8003,8009,8048],"details",{},[7830,7831,7832],"summary",{},"Answer",[19,7834,7835,7838,7839,7842,7843,7845,7846,7848,7849,7852,7853,7856,7857,1053],{},[23,7836,7837],{},"_$TaskFromJson"," looks for ",[23,7840,7841],{},"json['createdAt']"," (camelCase, matching the field name). The server sends ",[23,7844,7704],{}," (snake_case). ",[23,7847,7841],{}," is ",[23,7850,7851],{},"null"," — ",[23,7854,7855],{},"DateTime.parse(null)"," throws ",[23,7858,7859],{},"FormatException",[19,7861,7862,7863,7866],{},"The fix — use ",[23,7864,7865],{},"@JsonKey"," to map the JSON key to the Dart field name:",[32,7868,7870],{"className":34,"code":7869,"language":30,"meta":36,"style":36},"@freezed\nclass Task with _$Task {\n const factory Task({\n required String id,\n required String title,\n @JsonKey(name: 'created_at') required DateTime createdAt, \u002F\u002F ← map JSON key\n }) = _Task;\n\n factory Task.fromJson(Map\u003CString, dynamic> json) => _$TaskFromJson(json);\n}\n",[23,7871,7872,7876,7888,7898,7906,7914,7938,7948,7952,7982],{"__ignoreMap":36},[40,7873,7874],{"class":42,"line":43},[40,7875,4566],{"class":46},[40,7877,7878,7880,7882,7884,7886],{"class":42,"line":58},[40,7879,1681],{"class":46},[40,7881,4573],{"class":88},[40,7883,4576],{"class":46},[40,7885,4579],{"class":88},[40,7887,114],{"class":54},[40,7889,7890,7892,7894,7896],{"class":42,"line":68},[40,7891,206],{"class":46},[40,7893,4588],{"class":46},[40,7895,4573],{"class":88},[40,7897,4593],{"class":54},[40,7899,7900,7902,7904],{"class":42,"line":75},[40,7901,4598],{"class":46},[40,7903,187],{"class":88},[40,7905,4603],{"class":54},[40,7907,7908,7910,7912],{"class":42,"line":82},[40,7909,4598],{"class":46},[40,7911,187],{"class":88},[40,7913,4612],{"class":54},[40,7915,7916,7919,7922,7924,7927,7929,7931,7933,7935],{"class":42,"line":95},[40,7917,7918],{"class":46}," @JsonKey",[40,7920,7921],{"class":54},"(name",[40,7923,903],{"class":46},[40,7925,7926],{"class":50}," 'created_at'",[40,7928,299],{"class":54},[40,7930,5919],{"class":46},[40,7932,1843],{"class":88},[40,7934,7767],{"class":54},[40,7936,7937],{"class":78},"\u002F\u002F ← map JSON key\n",[40,7939,7940,7942,7944,7946],{"class":42,"line":100},[40,7941,4662],{"class":54},[40,7943,761],{"class":46},[40,7945,4667],{"class":88},[40,7947,55],{"class":54},[40,7949,7950],{"class":42,"line":106},[40,7951,72],{"emptyLinePlaceholder":71},[40,7953,7954,7956,7958,7960,7962,7964,7966,7968,7970,7972,7974,7976,7978,7980],{"class":42,"line":117},[40,7955,1895],{"class":46},[40,7957,4573],{"class":88},[40,7959,1053],{"class":54},[40,7961,1902],{"class":120},[40,7963,124],{"class":54},[40,7965,1907],{"class":88},[40,7967,736],{"class":54},[40,7969,459],{"class":88},[40,7971,130],{"class":54},[40,7973,1916],{"class":88},[40,7975,1919],{"class":54},[40,7977,252],{"class":46},[40,7979,4702],{"class":88},[40,7981,4705],{"class":54},[40,7983,7984],{"class":42,"line":139},[40,7985,623],{"class":54},[19,7987,7988,7989,7991,7992,7995,7996,7998,7999,8002],{},"Now ",[23,7990,7837],{}," reads ",[23,7993,7994],{},"json['created_at']"," and maps it to ",[23,7997,7708],{},". The generated code (after ",[23,8000,8001],{},"build_runner build",") handles the key mapping.",[19,8004,8005,8006,8008],{},"Or, configure ",[23,8007,7502],{}," globally to use snake_case:",[32,8010,8012],{"className":34,"code":8011,"language":30,"meta":36,"style":36},"@JsonSerializable(fieldRename: FieldRename.snake)\n\u002F\u002F or on freezed:\n@Freezed(fieldRename: FieldRename.snake)\n",[23,8013,8014,8030,8035],{"__ignoreMap":36},[40,8015,8016,8019,8022,8024,8027],{"class":42,"line":43},[40,8017,8018],{"class":46},"@JsonSerializable",[40,8020,8021],{"class":54},"(fieldRename",[40,8023,903],{"class":46},[40,8025,8026],{"class":88}," FieldRename",[40,8028,8029],{"class":54},".snake)\n",[40,8031,8032],{"class":42,"line":58},[40,8033,8034],{"class":78},"\u002F\u002F or on freezed:\n",[40,8036,8037,8040,8042,8044,8046],{"class":42,"line":68},[40,8038,8039],{"class":46},"@Freezed",[40,8041,8021],{"class":54},[40,8043,903],{"class":46},[40,8045,8026],{"class":88},[40,8047,8029],{"class":54},[19,8049,8050],{},"This maps ALL fields to snake_case in JSON. Use when the entire API uses snake_case (common in Go\u002FPython backends).",[8052,8053,8054],"style",{},"html pre.shiki code .svdQ7, html code.shiki .svdQ7{--shiki-default:#D73A49;--shiki-github-dark:#F97583}html pre.shiki code .sJ6F3, html code.shiki .sJ6F3{--shiki-default:#032F62;--shiki-github-dark:#9ECBFF}html pre.shiki code .ssxIu, html code.shiki .ssxIu{--shiki-default:#24292E;--shiki-github-dark:#E1E4E8}html pre.shiki code .sdCPZ, html code.shiki .sdCPZ{--shiki-default:#6A737D;--shiki-github-dark:#6A737D}html pre.shiki code .snvgF, html code.shiki .snvgF{--shiki-default:#005CC5;--shiki-github-dark:#79B8FF}html pre.shiki code .sIsaT, html code.shiki .sIsaT{--shiki-default:#6F42C1;--shiki-github-dark:#B392F0}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .github-dark .shiki span {color: var(--shiki-github-dark);background: var(--shiki-github-dark-bg);font-style: var(--shiki-github-dark-font-style);font-weight: var(--shiki-github-dark-font-weight);text-decoration: var(--shiki-github-dark-text-decoration);}html.github-dark .shiki span {color: var(--shiki-github-dark);background: var(--shiki-github-dark-bg);font-style: var(--shiki-github-dark-font-style);font-weight: var(--shiki-github-dark-font-weight);text-decoration: var(--shiki-github-dark-text-decoration);}html pre.shiki code .sXvq9, html code.shiki .sXvq9{--shiki-default:#005CC5;--shiki-default-font-weight:bold;--shiki-github-dark:#79B8FF;--shiki-github-dark-font-weight:bold}html pre.shiki code .sCrzJ, html code.shiki .sCrzJ{--shiki-default:#E36209;--shiki-github-dark:#FFAB70}",{"title":36,"searchDepth":58,"depth":58,"links":8056},[8057,8058,8059,8060,8065,8066,8067,8068],{"id":16,"depth":58,"text":17},{"id":1759,"depth":58,"text":1760},{"id":2808,"depth":58,"text":2809},{"id":4498,"depth":58,"text":4499,"children":8061},[8062,8063,8064],{"id":4516,"depth":68,"text":4517},{"id":4740,"depth":68,"text":4741},{"id":5827,"depth":68,"text":5828},{"id":6789,"depth":58,"text":6790},{"id":7452,"depth":58,"text":7453},{"id":7544,"depth":58,"text":7545},{"id":7694,"depth":58,"text":7695},"Deep-dive into real-world Dart projects — a production CLI parser, a zero-allocation data pipeline, an isolate-based image processor, a full-stack Flutter + dart_frog capstone with shared models, and a production checklist. 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