Changing a substring of textual content inside a bigger string has at all times been deceptive in JavaScript. I wrote Exchange All Occurrences of a String in JavaScript years in the past and it is nonetheless one in all my most learn articles.

The confusion lies in that exchange solely replaces the primary prevalence of a substring, not all occurrences. For instance:

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

To switch all situations of a substring, you’ve got wanted to make use of an everyday expression:

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

Utilizing common expressions is actually highly effective however let’s be trustworthy — oftentimes we merely need to exchange all situations of a easy substring that should not require an everyday expression.

Fortunately, this yr the JavaScript language supplied us with String.prototype.replaceAll, a technique for changing with out utilizing common expressions:

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

Generally an API exists in a complicated format and requirements our bodies merely want to enhance the scenario. I am glad they did so with replaceAll!