This content originally appeared on David Walsh Blog and was authored by David Walsh
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!
The post JavaScript String replaceAll appeared first on David Walsh Blog.
This content originally appeared on David Walsh Blog and was authored by David Walsh
David Walsh | Sciencx (2021-12-27T22:10:20+00:00) JavaScript String replaceAll. Retrieved from https://www.scien.cx/2021/12/27/javascript-string-replaceall/
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