void vs undefined

JavaScript performance comparison

Revision 12 of this test case created by Kyle A. Matheny

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
undefined
(function(a) {
 return (a === undefined);
})();
pending…
void
(function(a) {
 return (a === void 0);
})();
pending…
void2
function b(a) {
 return (a === void 0);
};

b();
pending…
typeof
function b(v) {
 return "undefined" === typeof(v);
}

b();
pending…
typeof 2
(function(v) {
 return "undefined" === typeof(v);
})();
pending…
undefined 2
function b(a) {
 return (a === undefined);
};

b();
pending…

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