In this lesson, you'll learn about changing the case of strings in JavaScript, using simple methods to convert text to uppercase or lowercase.

Changing the Case of a String

What is the case? You've definitely heard about uppercase and lowercase letters. In JavaScript, we have two straightforward methods for changing the character case:

These methods allow you to convert a string to all lowercase or all uppercase letters, respectively.

Let's see how these methods work in practice:

const mixedCaseString = 'Hello! How are you, James?';

console.log(mixedCaseString.toLowerCase()); // "hello! how are you, james?"
console.log(mixedCaseString.toUpperCase()); // "HELLO! HOW ARE YOU, JAMES?"

How It Works

Notice how we have parentheses on these methods. That's because they are functions, more precisely methods, that we call on a string. These methods do not modify the original string; instead, they return a new string with the desired case transformation.

Now that you've learned how to change the case of a string, let's explore more useful string methods! 😊

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