Testing forEach vs traditional for loops

index.js

'use strict'

const assert = require('node:assert')

// node --allow-natives-syntax index.js
const { Suite } = require('bench-node')
const suite = new Suite()

const data = Array.from('a'.repeat(125_000))

suite.add('forEach', () => {
	data.forEach(d => { assert.ok(d) })
})

suite.add('for...of', () => {
	for (const d of data) {
		assert.ok(d)
	}
})

// Enabling the for...in test causes the for...of test to perform way
// better. 
/*
suite.add('for...in', () => {
	for (const d in data) {
		assert.ok(d)
	}
})
*/

suite.add('for(;;)', () => {
	for (let i = 0; i < data.length; i += 1) {
		assert.ok(data[i])
	}
})

suite.run()