Check if a String is a palindrome with JavaScript Tutorial

Показать описание

Don’t forget to subscribe to the Junior Developer Central channel for more videos and tutorials!

So there are a couple of ways to check is a string is a palindrome in JavaScript and we’ll first look at what seems to be the most logical way of doing it which is using a for loop.

In the tutorial i’ll take you through the process of looping through a string to check if each character at opposite ends of the string are the same.

This process is a pretty simple way to check a string (or number) is a palindrome or not in JavaScript however we’ll look at one problem with this which is if the string has unexpected spaces, commas or other symbols. By definition, as long as the actual letters match up (without any of the symbols) then the string is technically still a palindrome so we should accept it.

So we need a way to remove these characters that we don’t want to check for in our palindrome with JavaScript. You’ll learn a simple way to do this using a Regular Expression.

Once you’ve learnt a way to check for a palindrome using a for loop, we’ll look at some ways of doing it with the javascript reverse function and also a bit of a more esoteric method using a filter function to remove items from the array if they don’t match the end of the string.

Other videos in the JavaScript Snippets series:

Рекомендации по теме

Комментарии

This was actually very useful! Thank you :)

marykhachatryan

I didn't think by myself about turn to lower case and removing the non-alphanumerical characters. I did it after watching the video. I used this solution:

const isPalyndrome = (str) => {
str = str.replace(/[^a-z]/gi, "").toLowerCase();
const reverse =
return str === reverse;
}

kremowydzien

You are amazing. Thank you for your efforts.

nageshthotakura

Can you do something on how to get odd and even numbers using arrays

Corumt

Could someone explain the
inStr[inStr.length - 1 - i]
I’m confused on this.

blurrywaters

I think your first solution was better than the second one

EduardoOviedoBlanco

i don't understand why - i? and not just[ inStr.length - 1 ]

Girlgirls

This code doesn't work with strings containing - (hyphen)or _ (underscore) eg "_eye" or "0_0 (: /-\ :) 0-0" ?

selchukkarakus

Why not use this i++ instead of i+=1 and inStr[inStr.length - 1] instead of this inStr[inStr.length - 1 -i ]

velmurugan.personel

Check if a String is a palindrome with JavaScript Tutorial

Check if a String Contains all Binary Codes of Size K - Leetcode 1461 - Python

How to search for a string or check if cell contains a specific text

Check If A String Is A Palindrome | Python Example

Check If A String Is A Palindrome | C Programming Example

How to check if a string is a palindrome or not? An Optimised Approach

Check If A String Is A Palindrome | C++ Example

Python program to check whether a string is palindrome or not #shorts #datascience

Find if one string is a rotation of another string

My language is bad at math | Better C Compiler Development [3]

Check if a string is a substring of another | GeeksforGeeks

Check If String Contains Any Letters from Alphabet in Python (Example) | any() & isalpha() Funct...

How To Fix Annoying String Buzz On Your Guitar

JavaScript String Contains: How to check a string exists in another

Using String Like A Pro

Check if Substring is Present in a Given String - Java Interview Question

Valid Parenthesis String - Leetcode 678 - Python

Check String Is Palindrome Or Not

Palindrome | Program to check if a string is Palindrome | Java

Frequently Asked Python Program 20:Check String is Palindrome or Not

3. String Manipulation, Guess and Check, Approximations, Bisection

Empty (Check if an Array, Object or String is Empty) Function / Expression | Power Automate

String Interleaving Dynamic Programming

How can you tell that a String is an anagram of another String? - Cracking the Java Coding Interview

String methods in Python are easy 〰️