hasOwnProperty vs in vs undefined (v12)

Revision 12 of this benchmark created on

Setup

var Iobj = {
    SUPPORT_ACTIONS: 0x1
  };
  var obj = {
    actions: true,
    support: Iobj.SUPPORT_ACTIONS
  };
  var undefined;

Test runner

Ready to run.

Testing in
TestOps/sec
hasOwnProperty
if (obj.hasOwnProperty("actions")) {
  return true;
}
ready
in
if ("actions" in obj) {
  return true;
}
ready
undefined
if (typeof obj.actions !== 'undefined') {
  return true;
}
ready
undefined cmp
if (obj.actions !== undefined) {
  return true;
}
ready
binary indicator
if (obj.support & Iobj.SUPPORT_ACTIONS) return true;
ready
undefined cmp (dynamic)
if (obj['actions'] !== undefined) {
  return true;
}
ready
undefined dynamic
if (typeof obj['actions'] !== 'undefined') {
  return true;
}
ready

Revisions

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