array cloning (v120)

Revision 120 of this benchmark created on

Description

speed comparissons between slice, splice, for, $.merge, Array

Preparation HTML

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

Setup

var a = [{
      test: 'bye'
    }, 'z', 'a', 'q', 'w', 's', 'x', 'c', 'd', 'v', 'e', 'f', 't', 'r'];
    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
for loop, pre-allocated + cached lenght
b = new Array(a.length);
for (var i = 0, length = a.length; i < length; ++i) {
  b[i] = a[i];
}
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.