"Type of undefined" vs "=== undefined" (v66)

Revision 66 of this benchmark created by bskaplou on

Setup

var a = 1,
      b = true,
      c = "c",
      d = [],
      e = {}, u;

Test runner

Ready to run.

Testing in
TestOps/sec
1) typeof undefined
typeof a === 'undefined';
typeof b === 'undefined';
typeof c === 'undefined';
typeof d === 'undefined';
typeof e === 'undefined';
ready
2) undefined typeof
'undefined' === typeof a;
'undefined' === typeof b;
'undefined' === typeof c;
'undefined' === typeof d;
'undefined' === typeof e;
ready
3) === undefined
a === undefined;
b === undefined;
c === undefined;
d === undefined;
e === undefined;
ready
4) undefined ===
undefined === a;
undefined === b;
undefined === c;
undefined === d;
undefined === e;
ready
5) === undefined(local)
a === u;
b === u;
c === u;
d === u;
e === u;
ready
5) undefined ==
undefined == a;
undefined == b;
undefined == c;
undefined == d;
undefined == e;
ready

Revisions

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