Benchmark char comparison methods in Dart

char_comparison_benchmark.dart

import 'package:benchmark_harness/benchmark_harness.dart';

const testString = 'this is a test string that you can ignore.';

class BareRunesForLoopBenchmark extends BenchmarkBase {
  const BareRunesForLoopBenchmark() : super('s.runes');

  static void main() => new BareRunesForLoopBenchmark().report();

  // The benchmark code.
  void run() {
    var res = 0;

    for (final r in testString.runes) {
      if (r == 115) res++;
    }

    res;
  }
}

class RegExpBenchmark extends BenchmarkBase {
  const RegExpBenchmark() : super('RegExp.allMatches(s)');

  static void main() => new RegExpBenchmark().report();

  // The benchmark code.
  void run() {
    new RegExp('s').allMatches(testString).length;
  }
}

class StringArrayForLoopBenchmark extends BenchmarkBase {
  const StringArrayForLoopBenchmark() : super('s[i] == "s"');

  static void main() => new StringArrayForLoopBenchmark().report();

  // The benchmark code.
  void run() {
    var res = 0;

    for (var i = 0; i < testString.length; i++) {
      if (testString[i] == 's') res++;
    }

    res;
  }
}

class RunesToFromCharCodeBenchmark extends BenchmarkBase {
  const RunesToFromCharCodeBenchmark() : super('s.runes == fromCharCode');

  static void main() => new RunesToFromCharCodeBenchmark().report();

  // The benchmark code.
  void run() {
    var res = 0;

    for (final r in testString.runes) {
      if (new String.fromCharCode(r) == 's') res++;
    }

    res;
  }
}

class CodeUnitsBenchmark extends BenchmarkBase {
  const CodeUnitsBenchmark() : super('s.codeUnits');

  static void main() => new CodeUnitsBenchmark().report();

  // The benchmark code.
  void run() {
    var res = 0;

    for (final r in testString.codeUnits) {
      if (r == 115) res++;
    }

    res;
  }
}

main() {
  // Run benchmarks.
  RunesToFromCharCodeBenchmark.main();
  BareRunesForLoopBenchmark.main();
  StringArrayForLoopBenchmark.main();
  CodeUnitsBenchmark.main();
  RegExpBenchmark.main();
}