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Convert a string to its uppercase form using JavaScript : toUpperCase()

   September 19, 2023
Java Script @ Freshers.in

The toUpperCase() method in JavaScript is used to convert a string to its uppercase form. This method is particularly useful when you want to normalize user input for comparison or ensure consistency in the visual representation of text.

One of the key features of toUpperCase() is that it does not affect any of the non-letter characters in a string, and it doesn’t change the original string itself but rather returns a new one.

Syntax: The syntax of the toUpperCase() method is simple and straightforward:

string.toUpperCase()

It takes no parameters, and it returns the calling string value converted to uppercase.

Examples and Execution: Below, we provide examples that can be run in any JavaScript environment, such as a browser’s developer console, an online code editor, or a Node.js environment.

Basic usage:

let greet = "Hello, World!";
let upperGreet = greet.toUpperCase();
console.log(upperGreet); // Outputs: "HELLO, WORLD!"
Use case
let input = "JavaScript";
let standard = "javascript";

if(input.toUpperCase() === standard.toUpperCase()) {
    console.log("The strings match!");
} else {
    console.log("The strings do not match!");
}
// Outputs: "The strings match!"

This example demonstrates a common use case where text input is converted to uppercase to standardize the comparison process, irrespective of how the original text was typed.

Normalizing usernames:

function normalizeUsername(username) {
    return username.trim().toUpperCase();
}

let username = " userExample ";
let normalizedUsername = normalizeUsername(username);
console.log(normalizedUsername); // Outputs: "USEREXAMPLE"

In this scenario, normalizeUsername is a function that takes a username, removes any leading or trailing spaces using the trim() method, and converts the username to uppercase to maintain consistency in username handling.

Non-letter characters:

let mixedString = "123Hi!";
let upperMixedString = mixedString.toUpperCase();
console.log(upperMixedString); // Outputs: "123HI!"
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