Javascript array concat vs push

JavaScript performance comparison

Revision 156 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
  var arr2 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
  var arr3 = []
  
  var arr = []
  var prealloc100 = new Array(100)
  var prealloc1000 = new Array(1000)
  var prealloc5000 = new Array(5000)

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
PreAlloc 5000
for (i = 0; i <= 5000; ++i) {
  arr[i] = i;
}
pending…
Reg Arr Push - 1000
for (i = 0; i <= 1000; ++i) {
  arr.push(i);
}
pending…
PreAlloc Array 100
for (i = 0; i <= 100; ++i) {
  arr[i] = i;
}
pending…
PreAlloc 1000
for (i = 0; i <= 1000; ++i) {
  arr[i] = i;
}
pending…
Reg Arr = 5000
for (i = 0; i <= 5000; ++i) {
  arr.push(i);
}
pending…
Regular Array Push - 100
for (i = 0; i <= 100; ++i) {
  arr.push(i);
}
pending…

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