FreeCodeCamp JavaScript String Transformer: replace(), replaceAll() & repeat() Tutorial

Published: 29 January 2026
on channel: The Code Zone Skool
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In this video, we tackle the FreeCodeCamp "Build a String Transformer" workshop to help you earn your JavaScript Algorithms and Data Structures certification.

We’ll walk through how to manipulate text data using essential JavaScript string methods. Whether you are a beginner or just need a refresher on string immutability and methods, this step-by-step guide covers everything from initializing variables to advanced formatting.

In this tutorial, you will learn:

How to use .replace() vs .replaceAll() to modify strings.

How to repeat strings efficiently using the .repeat() method.

Removing whitespace with .trimEnd().

The difference between string concatenation and Template Literals.

If you are stuck on a step or just want to code along with an instructor, this video is for you!


💻 Code Snippets & Resources:

Method Docs: MDN Web Docs - String.prototype.replace()

FreeCodeCamp Challenge: Build a String Transformer

👨‍🏫 About the Instructor: My name is Rob, and I’m a coding instructor and the founder of the Code Zone School. I create these walkthroughs to help you see code from an instructor's perspective, breaking down complex concepts into easy-to-follow steps.

Steps 5 to 11 are found here: https://www.skool.com/the-code-zone/c...

#Hashtags: #JavaScript #FreeCodeCamp #LearnToCode #WebDevelopment #StringMethods #CodingTutorial #RobVanArsdall

00:00 Introduction and Overview
00:47 Setting Up the Initial String
02:34 Console Logging the String
04:38 Using the Replace Method


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