array cloning (v116)

Revision 116 of this benchmark created by Daneu on

Description

speed comparissons between slice, splice, for, $.merge, Array, with bigger arrays

Preparation HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>

Setup

var a = new Array(1000000);
    for(var i = 0; i < 1000000; i++) {
     a[i] = 1000000 - i;
    }
    var b;

Teardown


    if (b.length !== a.length) {
      throw {message: "Test failed! b.length !== a.length"};
    }
    b[0].test = 'hi';
    if (a[0].test === 'hi') {
    //  throw {message: "Not a deep clone"};
    }
    for (var i = 1, l = a.length; i < l; i++) {
      if (b[i] !== a[i]) {
        throw {message: "Test failed! b array is " + b};
      }
    }

Test runner

Ready to run.

Testing in
TestOps/sec
slice
b = a.slice();
 
ready
concat
b = [].concat(a);
 
ready
for-unshift
b = [];
for (var i = a.length; i--; ) {
  b.unshift(a[i]);
}
 
ready
for-push
b = [];
for (var i = 0, l = a.length; i < l; i++) {
  b.push(a[i]);
}
 
ready
for-index
b = [];
for (var i = 0, l = a.length; i < l; i++) {
  b[i] = a[i];
}
 
ready
while loop
b = [];
var i = a.length;
while(i--) { b[i] = a[i]; }
ready
slice(0)
b = a.slice(0);
 
ready
a.concat()
b = a.concat()
ready
Array
b = Array.apply(undefined,a);
 
ready
while loop, pre-allocated
b = new Array(a.length);
var i = a.length;
while(i--) { b[i] = a[i]; }
ready

Revisions

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