Javascript array concat vs push

JavaScript performance comparison

Revision 113 of this test case created by Fabio Tacchelli

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
  var arr2 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
  var arr3 = []

};
</script>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
push.apply
for (i = 1000; i > 0; i--) {
  Array.prototype.push.apply(arr3, arr1);
  Array.prototype.push.apply(arr3, arr2);
}
pending…
concat
for (i = 1000; i > 0; i--) {
  arr3 = arr1.concat(arr2);
}
pending…
push
for (i = 1000; i > 0; i--) {
  for (t = 0; t < arr1.length; t++) {
    arr3.push(arr1[t]);
  }
  for (t = 0; t < arr2.length; t++) {
    arr3.push(arr2[t]);
  }
}
pending…

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