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

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Chrome 122
Windows
Desktop
one year ago
Test name Executions per second
test truth 92841448.0 Ops/sec
test undefined 5950026.5 Ops/sec
test hasOwnProperty 48999452.0 Ops/sec
test hasown 5378097.0 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;
    }

  • test hasown

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