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_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36
Chrome 90
Mac OS X 10.14.6
Desktop
3 years ago
Test name Executions per second
test truth 861612160.0 Ops/sec
test undefined 6699871.0 Ops/sec
test hasOwnProperty 73582040.0 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;
    }