push allocated vs dynamic (v4)

Revision 4 of this benchmark created on

Description

is it usefull to pre-allocate the array by setting the last value first when assigning some values ?

Setup

var n = 10000;
    var myArray = [];
    var myArray2 = new Array(n);

Test runner

Ready to run.

Testing in
TestOps/sec
push
for (var i = 0; i < n; i++) {
  myArray.push(i)
}
ready
reverse writing
  var i = n;
  while (i--) {
    myArray[i] = i
  }
ready
reverse writing, array allocated with Array constructor
  var i = n;

  while (i--) {
    myArray2[i] = i
  }
ready

Revisions

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