Run results for: (many keys fixed) hasOwnPropery vs Loop vs if ... in vs Object.entries

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

if ... in

17.7M/s

hasOwnPropery

17.0M/s

Loop

170/s

Object.entries

48/s

View exact numbers

Test name	Executions per second
✓ if ... in	17,719,618 Ops/sec
hasOwnPropery	17,031,168 Ops/sec
Loop	170 Ops/sec
Object.entries	48 Ops/sec

Script Preparation code:

const keysLength = 100 * 1000;
var value = {}
for (let i = 0; i < keysLength; i++) {
    if (i === 50 * 1000) {
        value.name = 'Mark'
    }
    value[i] = i
}

Tests:

hasOwnPropery
value.hasOwnProperty('name');
Loop
for (const key in value) { if (key === 'name') break; }
if ... in
if ('name' in value) { }
Object.entries
Object.entries(value).find(x => x[0] === 'name')