set default param with if or ||

Benchmark created on August 12, 2011

Preparation HTML

<script>
  function ifAssign(x) { /* assign default value if x has not been passed as arg */
    if (!x) {
      x = {};
    }
  }
  
  function ifAssignEquals(x) { /* assign default value if x has not been passed as arg */
    if (x === undefined) {
      x = {};
    }
  }
  
  function ifAssignTypeof(x) { /* assign default value if x has not been passed as arg */
    if (typeof x === "undefined") {
      x = {};
    }
  }
  
  function orAssign(x) { /* assign default value if x has not been passed as arg */
    var x = x || {};
  }
</script>

Test runner

ifAssign()

ifAssignEquals()

ifAssignTypeof()

orAssign()

Revisions

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

• Revision 1: published on August 12, 2011