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 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0

Browser: Firefox 72

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Map replace	1262364.0 Ops/sec
Regex replace	1270145.5 Ops/sec
Make array replace	1935624.5 Ops/sec
Make unfilled array replace	661382.8 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