Regexp vs slice

Benchmark created on

Setup

const randFrom = (arr) => arr[Math.floor((Math.random()*arr.length))];


const idregex = /^(?<type>investigation|surface|shared)(?<id>.*)$/

const prefixes = ["investigation", "surface", "shared", "something", "else"]
const strings = Array(10000).fill().map((x, i) => `${randFrom(prefixes)}:test${i}`)

let hits = 0

Teardown

console.log(hits)

Test runner

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Testing in
TestOps/sec
Regex
const str = randFrom(strings)

const match = str.match(idregex)
if (match) {
	const type = match?.groups.type
	const id = match?.groups.id
	
	if (type === 'investigation') {
		hits += 1
	} else if (type === 'shared') {
		hits += 1		
	} else if (type === 'surface') {
		hits += 1	
	}
}
ready
Direct
const str = randFrom(strings)

if (str.startsWith('investigations')) {
	const id = str.slice('investigations'.length)
	hits += 1
} else if (str.startsWith('shared')) {
	const id = str.slice('shared'.length)
	hits += 1
} else if (str.startsWith('surface')) {
	const id = str.slice('surface'.length)
	hits += 1
}
ready

Revisions

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