String Concatenation Benchmark

stringbench.dart

const int count = 100000;

void test(String s) {}

void main() {
  Stopwatch t = new Stopwatch();

  // Run more than once to account for JIT compilation and optimization.
  for (int i = 0; i < 3; i++) {
    // USING STRING
    {
      int e = 0;
      int c = 0;
      t.reset();
      t.start();
      do {
        String s = '';
        for (int i = 0; i < count; i += 1) {
          s = s + '-$i';
          test(s);
        }
        c++;
        e = t.elapsedMicroseconds;
      } while (e < 2000000);
      t.stop();
      print("String 1: ${c * 1000000 / e} /s");
    }

    // USING STRING 2
    {
      int e = 0;
      int c = 0;
      t.reset();
      t.start();
      do {
        String s = '';
        for (int i = 0; i < count; i += 1) {
          s = '$s-$i';
          test(s);
        }
        c++;
        e = t.elapsedMicroseconds;
      } while (e < 2000000);
      t.stop();
      print("String 2: ${c * 1000000 / e} /s");
    }

    // USING STRINGBUFFER
    {
      int e = 0;
      int c = 0;
      t.reset();
      t.start();
      do {
        StringBuffer b = new StringBuffer();
        for (int i = 0; i < count; i += 1) {
          b.write('-$i');
          test(b.toString());
        }
        c++;
        e = t.elapsedMicroseconds;
      } while (e < 2000000);
      t.stop();
      print("StringBuffer 1: ${c * 1000000 / e} /s");
    }

    // USING STRINGBUFFER 2
    {
      int e = 0;
      int c = 0;
      t.reset();
      t.start();
      do {
        StringBuffer b = new StringBuffer();
        for (int i = 0; i < count; i += 1) {
          b..write('-')..write(i);
          test(b.toString());
        }
        c++;
        e = t.elapsedMicroseconds;
      } while (e < 2000000);
      t.stop();
      print("StringBuffer 2: ${c * 1000000 / e} /s");
    }
  }
}