MeasureThat.net

Run results for: Array vs Map vs object iteration 2

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.5 Safari/605.1.15
Safari 13
Mac OS X 10.15.3
Desktop
5 years ago
Test name Executions per second
Array.forEach 4747.5 Ops/sec
Array for...of 5720.8 Ops/sec
Map.forEach 4872.9 Ops/sec
object for...in 2268.4 Ops/sec
Script Preparation code:
AخA
 
var array = []
var map = new Map()
var object = {}
for (var i = 0; i < 2000; i++) {
    array[i] = i;
    map.set(i.toString(), i);
    object[i.toString()] = i;
}
var results = []
Tests:

  • Array.forEach

     
    array.forEach(i => {
      results.push(i * 2)
    })

  • Array for...of

     
    for (const i of array) {
      results.push(i * 2)
    }

  • Map.forEach

     
    map.forEach(i => {
      results.push(i * 2)
    })

  • object for...in

     
    for (const i in object) {
      results.push(object[i] * 2)
    }