String Is Lowercase

Introduction

In this lab, we will explore the concept of checking if a given string is in lowercase or not using JavaScript. We will learn about the String.prototype.toLowerCase() method, which is used to convert a given string to lowercase. By the end of this lab, you will be able to write a function that checks if a string is in lowercase or not.

Skills Graph

JavaScript Function to Check if a String is Lowercase

To check if a given string is lowercase, you can use the following JavaScript function. First, convert the string to lowercase using String.prototype.toLowerCase() and then compare it to the original string using strict equality (===).

const isLowerCase = (str) => str === str.toLowerCase();

Here's an example usage:

isLowerCase("abc"); // true
isLowerCase("a3@$"); // true
isLowerCase("Ab4"); // false

To use this function, open the Terminal/SSH and type node.

Summary

Congratulations! You have completed the String Is Lowercase lab. You can practice more labs in LabEx to improve your skills.