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String Is Uppercase

Beginner

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Introduction

In this lab, we will explore how to check if a given string is in uppercase using JavaScript. We will create a function that converts the string to uppercase using the String.prototype.toUpperCase() method, and then compare it to the original string. By the end of this lab, you will have a better understanding of string manipulation in JavaScript and how to check for uppercase strings.

Function to Check if a String is Uppercase

To check if a string is in uppercase, follow these steps:

  1. Open the Terminal/SSH.
  2. Type node.
  3. Use the function isUpperCase() to convert the given string to uppercase, using String.prototype.toUpperCase(), and compare it to the original string.
  4. The function will return true if the string is in uppercase and false if it is not.

Here is an example code:

const isUpperCase = (str) => str === str.toUpperCase();

console.log(isUpperCase("ABC")); // true
console.log(isUpperCase("A3@$")); // true
console.log(isUpperCase("aB4")); // false

Summary

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