Run results for: for object - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
forEach over entries	12671.6 Ops/sec
for of over entires	12677.5 Ops/sec
forEach over values	15936.2 Ops/sec
for of over values	15784.3 Ops/sec
forEach over keys	5061.4 Ops/sec
for of over keys	5075.4 Ops/sec
for in	5085.1 Ops/sec

Script Preparation code:

var object = Object.fromEntries(Array(1000).fill().map(() => [Math.random(), Math.random()]));
var t;

Tests:

forEach over entries
Object.entries(object).forEach((v, k) => { t = v })
for of over entires
for (const [v, k] of Object.entries(object)) { t = v }
forEach over values
Object.values(object).forEach((v) => { t = v })
for of over values
for (const v of Object.values(object)) { t = v }
forEach over keys
Object.keys(object).forEach((k) => { t = object[k] })
for of over keys
for (const k of Object.keys(object)) { t = object[k] }
for in
for (const k in object) { t = object[k] }

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