Run results for: for-of-vs-map

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/114.0

Browser: Firefox 114

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for of	31138.2 Ops/sec
map	33171.8 Ops/sec

Script Preparation code:

var arr = [];
for (var i = 0; i < 1000; i++) {
    arr[i] = {
        name: `${i}`,
        value: i
    };
}

function someFn(i) {
    const x24 = i.value * 3 * 8;
    i.value = x24;
    i.name = `${x24}`;
    return i;
}

​x
 
var arr = [];for (var i = 0; i < 1000; i++) {    arr[i] = {        name: `${i}`,        value: i    };}​function someFn(i) {    const x24 = i.value * 3 * 8;    i.value = x24;    i.name = `${x24}`;    return i;}

Tests:

for of

const x = []
for (var y of arr) {
  x.push(someFn(y));
}

 
const x = []for (var y of arr) {  x.push(someFn(y));}

map
arr.map(item => someFn(item))
arr.map(item => someFn(item))