typeof undefined

JavaScript performance comparison

Test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var a = 1;
    var b = undefined;
};
</script>

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Testing in unknown unknown
Test Ops/sec
typeof
typeof a === undefined;
typeof b === undefined;
pending…
no typeof
a === undefined;
b === undefined;
pending…
gte
a >= 0;
b >= 0;
pending…
not eq
a !== undefined;
b !== undefined;
pending…

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