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

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0
Firefox 72
Windows
Desktop
5 years ago
Test name Executions per second
Map replace 1247872.2 Ops/sec
Regex replace 1164045.8 Ops/sec
Make array replace 1995265.0 Ops/sec
Script Preparation code:
​x
 
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 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);