Array direct assignment vs push (v29)

Revision 29 of this benchmark created by kybernetikos on

Setup

var array = new Array(100);
    var array2 = [];
    array2.len = 0;
    var other_array = 0;

Test runner

Ready to run.

Testing in
TestOps/sec
Direct assignment
for(var i = 0; i < 100; i++)
{
  array[i] = "test";
}
ready
Push
for(var i = 0; i < 100; i++)
{
  array.push("test");
}
ready
Direct assignment (calculated)
for(var i = 0; i < 100; i++)
{
  array[array.length] = "test";
}
ready
other
for(var i = 0; i < 100; i++)
{
  array[other_array++] = "test";
}
ready
array2.len
for(var i = 0; i < 100; i++)
{
  array2[array2.len++] = "test";
}
ready
array2.push
for(var i = 0; i < 100; i++)
{
  array2.push("test");
}
ready
Reverse
for(var i = 99; i >= 0; --i)
{
  array[i] = "test";
}

// as is common, working in reverse is often faster.  This seems to be particularly the case in ff.
ready
Assignment to previously stored.
var x = "test";
for(var i = 0; i < 100; i++)
{
  array[i] = x;
}
ready

Revisions

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