Text Processing with JavaScript

replaceAll()

The replaceAll() method outputs the same result as replace() when the global flag is set. Compare:

appendix/methods/methods_ex13.js

const str = "$5, $10, $20";
const re = /\$/g;

console.log(str.replace(re, "€"));      // → €5, €10, €20
console.log(str.replaceAll(re, "€"));   // → €5, €10, €20

As a result, calling replaceAll() doesn’t seem to yield much benefit over calling replace(). The main difference between the two methods is how replaceAll() handles replacement when the pattern is a string, as opposed to a regex:

appendix/methods/methods_ex14.js

const str = "$5, $10, $20";
const searchStr = "$";

console.log(str.replace(searchStr, "€"));      // → €5, $10, $20
console.log(str.replaceAll(searchStr, ...