Run results for: merge maps

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

merge 2 foreach

212K/s

merge foreach

198K/s

Merge spread

128K/s

View exact numbers

Test name	Executions per second
✓ merge 2 foreach	211,566 Ops/sec
merge foreach	197,695 Ops/sec
Merge spread	128,171 Ops/sec

Script Preparation code:

const arr = [];
const arr2 = [];
for (let i = 0; i < 100; i++) {
    arr.push([i, 'Val' + i]);
    arr2.push(['key' + i, 'Val' + i]);
}

var map1 = new Map(arr)
var map2 = new Map(arr2)

Tests:

Merge spread
var map3 = new Map([...map1, ...map2]);
merge foreach
var map4 = new Map(map1) map2.forEach((val, key) => {map4.set(key, val)})
merge 2 foreach
var map4 = new Map() map1.forEach((val, key) => {map4.set(key, val)}) map2.forEach((val, key) => {map4.set(key, val)})