Undefined testing performance

JavaScript performance comparison

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Testing in unknown unknown
Test Ops/sec
TypeOf
var loops = 1e6,
    undef = void 0,
    foo;
 
while(loops--) {
    if( typeof foo !== 'undefined' ) {}
}
pending…
Cached undefined
var loops = 1e6,
    undef = void 0,
    foo;
 
while(loops--) {
    if( foo !== undef) {}
}
pending…
Direct undefined
var loops = 1e6,
    undef = void 0,
    foo;
 
while(loops--) {
    if( foo !== undefined) {}
}
pending…
Calculated undefined
var loops = 1e6,
    undef = void 0,
    foo;
 
while(loops--) {
    if( foo !== void 0) {}
}
pending…

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