lodash_vs_simple.js

lodash_vs_simple.js

'use strict'
const _ = require('lodash')

function intersection(source, target) {
	let result = []
	
	for (let i = source.length - 1; i >= 0; i--) {
		let value = source[i]
		if (target.indexOf(value) > - 1) {
			result.push(value)
		}
	}

	return result
}


let longArray = []
let shortArray = []

for (let i = 0; i < 1000; i++) {
	longArray.push(i)
	if (i % 20 === 0)
		shortArray.push(i)
}

console.log('longArray %d', longArray.length)
console.log('shortArray %d', shortArray.length)

console.time('gt')
let result
for (let i = 0; i < 10000; i++) {
	result = intersection(longArray, shortArray)
}
console.timeEnd('gt')
console.log(result.length)

console.time('lodash')
for (let i = 0; i < 10000; i++) {
	result = _.intersection(longArray, shortArray)
}
console.timeEnd('lodash')
console.log(result.length)