Run results for: Direct property lookup vs in vs typeof

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) Gecko/20100101 Firefox/92.0

Browser: Firefox 92

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Check via direct property lookup	96205.3 Ops/sec
Check via in	93954.6 Ops/sec
Check via typeof	97404.1 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'); }