Run results for: Asterisk map replace vs stored regex replace vs make an array replace vs unfilled array replace

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-G991B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Mobile Safari/537.36

Browser: Chrome Mobile 92

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Map replace	1287993.8 Ops/sec
Regex replace	974016.8 Ops/sec
Make array replace	1031624.8 Ops/sec
Make unfilled array replace	1830429.4 Ops/sec

Script Preparation code:

var re = /./gi;
function mapReplace(value) {
  return value.split("").map((x, index, arr) => "*").join("")
}

function makeArrayReplace(value) {
  return (new Array(value.length)).fill("*").join("");
}

function makeUnfilledArrayReplace(value) {
  return (new Array(value.length + 1)).join("*");
}

function regexReplace(value) {
  return value.replace(re, "*");
}

Tests:

Map replace
const input = "abcdefghijklmnopqrstuvwxyz"; mapReplace(input);
Regex replace
const input = "abcdefghijklmnopqrstuvwxyz"; regexReplace(input);
Make array replace
const input = "abcdefghijklmnopqrstuvwxyz"; makeArrayReplace(input);
Make unfilled array replace
const input = "abcdefghijklmnopqrstuvwxyz"; makeUnfilledArrayReplace(input);

Run results for: Asterisk map replace vs stored regex replace vs make an array replace vs unfilled array replace

Map replace

Regex replace

Make array replace

Make unfilled array replace