push allocated vs dynamic (v42)

Revision 42 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 = [];

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--) { myArray[i] =i }  
ready
auto incr
var i=n;
  while (i--) { myArray[myArray.length] =i }  
ready
auto incr + forward
var i;
  for (i=0; i < n; i++) { myArray[myArray.length] =i }  
ready
auto incr + forward + extra cnt
var i, j = 0;
  for (i=0; i < n; i++) { myArray[j++] =i; }
ready

Revisions

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