Exploring JavaScript Programming Fundamentals

Introduction

In this lab, we will delve into the fascinating world of JavaScript programming. Through various exercises and challenges, we will explore the fundamentals of the language and learn how to write efficient and effective code. By the end of this lab, you will have a solid foundation in JavaScript programming and be able to build your own applications with confidence.

Skills Graph

How to Check if a String is a Palindrome in JavaScript?

To check if a given string is a palindrome in JavaScript, follow these steps:

1. Open the Terminal/SSH and type node to start practicing coding.
2. Normalize the string to lowercase using String.prototype.toLowerCase() method.
3. Remove non-alphanumeric characters from the string using String.prototype.replace() method and a regular expression [\W_].
4. Split the normalized string into individual characters using the spread operator (...).
5. Reverse the array of characters using Array.prototype.reverse() method.
6. Join the reversed array of characters into a string using Array.prototype.join() method.
7. Compare the reversed string to the normalized string to determine if it's a palindrome.

Here's an example code snippet that implements the above steps:

const palindrome = (str) => {
  const normalizedStr = str.toLowerCase().replace(/[\W_]/g, "");
  return normalizedStr === [...normalizedStr].reverse().join("");
};

console.log(palindrome("taco cat")); // true

In the above example, the palindrome() function takes a string argument and returns true if the string is a palindrome, and false otherwise. The function uses the steps outlined above to check if the string is a palindrome.

Summary

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