make filled array

JavaScript performance comparison

Test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  function spliceMap(length, fill){
  	var a = [], b = [];
  	a.length = length + 2;
          a[0] = 0; a[1] = 0;
  	b.splice.apply(b,a);
  	return b.map(function(){return fill;});
  }
  
  function pushMap(length, fill){
  	var a = [], b = [];
  	a.length = length;
  	b.push.apply(b,a);
  	return b.map(function(){return fill;});
  }
  
  function whileLengthNew(len, val) {
      var rv = new Array(len);
      while (--len >= 0) {
          rv[len] = val;
      }
      return rv;
  }
  
  function whileLengthLiteral(len, val) {
      var rv = [];
      while (--len >= 0) {
          rv[len] = val;
      }
      return rv;
  }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
spliceMap
spliceMap(255,0);
spliceMap(255,true);
pending…
pushMap
pushMap(255,0);
pushMap(255,true);
pending…
whileLengthLiteral
whileLengthLiteral(255,0);
whileLengthLiteral(255,true);
pending…
whileLengthNew
whileLengthNew(255,0);
whileLengthNew(255,true);
pending…
BIG pushMap
pushMap(65536,0);
pushMap(65536,true);
pending…
BIG whileLengthNew
whileLengthNew(65536,0);
whileLengthNew(65536,true);
pending…

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