"Type of undefined" vs "=== undefined" (v31)

Revision 31 of this benchmark created on

Setup

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

Test runner

Ready to run.

Testing in
TestOps/sec
typeof undefined
typeof a === 'undefined';
typeof b === 'undefined';
typeof c === 'undefined';
typeof d === 'undefined';
typeof e === 'undefined';
ready
=== undefined
a === undefined;
b === undefined;
c === undefined;
d === undefined;
e === undefined;
ready
=== undefined(local)
a === u;
b === u;
c === u;
d === u;
e === u;
ready
void 0
!! a !! b !! c !! d !! e
ready
typeof ==
typeof a == 'undefined';
typeof b == 'undefined';
typeof c == 'undefined';
typeof d == 'undefined';
typeof e == 'undefined';
ready

Revisions

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