Run results for: Direct property lookup vs in vs typeof

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser: Chrome 93

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Check via direct property lookup	155744.7 Ops/sec
Check via in	151029.0 Ops/sec
Check via typeof	150876.5 Ops/sec

Script Preparation code:

var host = {
    method: function() {
        console.log('method is invoked');
    }
}

Tests:

Check via direct property lookup
if(host.method) { console.log('method exists'); }
Check via in
if('method' in host) { console.log('method exists'); }
Check via typeof
if(typeof host['method'] !== 'undefined') { console.log('method exists'); }