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How to Fix the JavaScript .replaceAll() is not a function Error?

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Sometimes, we may run into the JavaScript .replaceAll() is not a function error in some browsers.

In this article, we’ll look at how to fix the JavaScript .replaceAll() is not a function error in some browsers.

Fix the JavaScript .replaceAll() is not a function Error

To fix the JavaScript .replaceAll() is not a function error in some browsers, we can add a polyfill to make the method available in all browsers.

For instance, we write:

if (typeof String.prototype.replaceAll == "undefined") {  
  String.prototype.replaceAll = function(match, replace) {  
    return this.replace(new RegExp(match, 'g'), () => replace);  
  }  
}

to add the code for the JavaScript string replaceAll method.

It adds an instance method that calls replace with a global regex to match all the substrings that matches the given regex.

Then the callback in the 2nd argument of replace is called to replace all substring matches with replace .

Most newer browsers should have this method built into the browser, so this is only needed for supporting older browsers.

Conclusion

To fix the JavaScript .replaceAll() is not a function error in some browsers, we can add a polyfill to make the method available in all browsers.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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