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JavaScript performance comparison

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Testing in unknown unknown
Test Ops/sec
aaa
function a(){
  var pattern = '';
  for(var i=0; i < 30; i++) {
    var d = Math.random() > 0.5 ? 1 : 0;
    pattern += d;
  }
  return pattern;
};

a();
pending…
bbbbb
function a(){
  var pattern = 0;
  for(var i=0; i < 30; i++) {
    var d = Math.random() > 0.5 ? 1 : 0;
    pattern += d << i;
  }
  return pattern;
};

a();
pending…

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