Run results for: for loop vs. .map (collection)

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Android

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

.map

1/s

for loop

1/s

View exact numbers

Test name	Executions per second
✓ .map	1 Ops/sec
for loop	1 Ops/sec

Script Preparation code:

var random = (x) => Math.round(x * Math.random());
                   
var creatures = new Array(1_000_000).fill(null).map(_ => ({
	name: 'Floantyrexitor',
  	age: random(100)
}));

var transform = ({name, age}) => ({
	mena: name.toUpperCase(),
  	gea: random(age)
})

Tests:

.map
creatures.map(item => transform(item));
for loop
var rescreatu = []; for (let key = 0; key < creatures.length; key++) { rescreatu.push(transform(creatures[key])); }