Array direct assignment vs push (v45)

Revision 45 of this benchmark created on

Description

Math.random() is pretty heavy operation to have it in test case. Also removed preparation code from test cases. For loop length should be much longer to test more of array manipulation then loop preparation.

Setup

var values = [],
        count = 10000;
    
    for (var i = 0; i < count; i++) {
      values[i] = i;
    }

Test runner

Ready to run.

Testing in
TestOps/sec
Direct assignment
var array = [];
for (var i = 0; i < count; i++) {
  array[i] = values[i];
}
ready
Push
var array = [];
for (var i = 0; i < count; i++) {
  array.push(values[i]);
}
ready
Accessing length property
var array = [];
for (var i = 0; i < count; i++) {
  array[array.length] = values[i];
}
ready
Cached length
var arrayLength = 0;
var array = [];
for (var i = 0; i < count; i++) {
    array[arrayLength++] = values[i];
}
ready

Revisions

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