Run results for: Regexp creation vs memoization

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Browser: Chrome 66

Operating system: Windows

Device Platform: Other

Date tested: 5 years ago

Test name	Executions per second
constructor	1273733.0 Ops/sec
memoize	2388045.0 Ops/sec
common boilerplate	3612839.0 Ops/sec

Script Preparation code:

var cache = {}
const regexps = [
  /^((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))*$/,
  /^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|622((12[6-9]|1[3-9][0-9])|([2-8][0-9][0-9])|(9(([0-1][0-9])|(2[0-5]))))[0-9]{10}|64[4-9][0-9]{13}|65[0-9]{14}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})*$/,
  /[^@/]+@[^@/]+/,
  /\\s+/,
  /[^a-zA-Z0-9]/,
  /^$/,
  /^[1-9]+[0-9]*$/,
  /(^\d*\.?\d*[0-9]+\d*$)|(^[0-9]+\d*\.\d*$)/,
  /^-?[0-9]{0,2}(\.[0-9]{1,2})?$|^-?(100)(\.[0]{1,2})?$/,
]
const sources = regexps.map(r => r.source)
regexps.forEach(r => {
  cache[r.source] = r
})

const n = sources.length
const floor = Math.floor
const random = Math.random
function getRandomSource () {
  return sources[floor(random() * n)]
}

Tests:

constructor
window.result = new RegExp(getRandomSource())
memoize
window.result = cache[getRandomSource()]
common boilerplate
window.result = getRandomSource()

Run results for: Regexp creation vs memoization

I need to obtain and use regexps from a string. I'm testing wether I should cache regexps or just construct them on demand.

constructor

memoize

common boilerplate