MeasureThat.net

Run results for: Testing for false vs === undefined vs hasOwnProperty for undefined member

Is there a performance benefit to replacing === undefined with a logical test?

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.5.1 Safari/605.1.15
Safari 16
Mac OS X 10.15.7
Desktop
one year ago
Test name Executions per second
test truth 245539008.0 Ops/sec
test undefined 7262662.0 Ops/sec
test hasOwnProperty 53511724.0 Ops/sec
Tests:

  • test truth

    AخA
     
    var n = {};
    while(true) {
        if(!n.foo) 
            break;
    }

  • test undefined

     
    var n = {};
    while(true) {
        if(n.foo===undefined) 
            break;
    }

  • test hasOwnProperty

     
    var n = {};
    while(true) {
        if(!n.hasOwnProperty('foo')) 
            break;
    }