startsWith

JavaScript performance comparison

Revision 25 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  a = ["test"];
  for (var i = 0; i < 10000; i++) {
    a.push("some other stuff");
  }
  s = a.join();

};
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
indexOf
r1 = (s.indexOf("test") == 0);
r2 = (s.indexOf("not there") == 0);
pending…
lastIndexOf
r1 = (s.lastIndexOf("test", 0) == 0);
r2 = (s.lastIndexOf("not there", 0) == 0);
pending…
substring
r1 = (s.substring(0, "test".length) == "test");
r2 = (s.substring(0, "not there".length) == "not there");
pending…
slice
r1 = (s.slice(0, "test".length) == "test");
r2 = (s.slice(0, "not there".length) == "not there");
pending…
regex
r1 = (/^test/).test(s);
r2 = (/^not there/).test(s);
pending…
hand
r1 = s[0] === 't' && s[1] === 'e' && s[2] === 's' && s[3] === 't'
r2 = s[0] === 'n' && s[1] === 'o' && s[2] === 't' && s[3] === ' ' && s[4] === 't' && s[5] === 'h' && s[6] === 'e' && s[7] === 'r' && s[8] === 'e'
pending…

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Revisions

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