JavaScript String replaceAll

By  on  

Replacing a substring of text within a larger string has always been misleading in JavaScript. I wrote Replace All Occurrences of a String in JavaScript years ago and it's still one of my most read articles.

The confusion lies in that replace only replaces the first occurrence of a substring, not all occurrences. For example:

'yayayayayaya'.replace('ya', 'na');
// nayayayayaya

To replace all instances of a substring, you've needed to use a regular expression:

'yayayayayaya'.replace(/ya/g, 'na');
// nananananana

Using regular expressions is certainly powerful but let's be honest -- oftentimes we simply want to replace all instances of a simple substring that shouldn't require a regular expression.

Luckily, this year the JavaScript language provided us with String.prototype.replaceAll, a method for replacing without using regular expressions:

'yayayayayaya'.replaceAll('ya', 'na');
// nananananana

Sometimes an API exists in a confusing format and standards bodies simply need to improve the situation. I'm glad they did so with replaceAll!

Recent Features

  • By
    Create Namespaced Classes with MooTools

    MooTools has always gotten a bit of grief for not inherently using and standardizing namespaced-based JavaScript classes like the Dojo Toolkit does.  Many developers create their classes as globals which is generally frowned up.  I mostly disagree with that stance, but each to their own.  In any event...

  • By
    LightFace:  Facebook Lightbox for MooTools

    One of the web components I've always loved has been Facebook's modal dialog.  This "lightbox" isn't like others:  no dark overlay, no obnoxious animating to size, and it doesn't try to do "too much."  With Facebook's dialog in mind, I've created LightFace:  a Facebook lightbox...

Incredible Demos

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!