Palindrome Checker

A palindrome is a word, phrase, or sequence that reads the same backward as forward. For example, "racecar" or "madam".

Write a function isPalindrome(str) that takes a string and returns true if the string is a palindrome and false if it is not.

For this challenge, we should ignore punctuation, spaces, and casing. So, "A man, a plan, a canal: Panama" should return true.

Here are some test cases:

• isPalindrome("racecar") should return true

• isPalindrome("hello") should return false

• isPalindrome("A man, a plan, a canal: Panama") should return true

You already know how to reverse a string, which is half the battle! The other half is cleaning up the input string first.

💡 The 'Syntax Nudge'

To solve this, you'll need to "sanitize" the input string before you check it. I suggest you research these two tools:

• String.prototype.toLowerCase(): How can you make sure "T" is treated the same as "t"?

• String.prototype.replace(): This method is incredibly powerful. Specifically, look up how to use it with a bit of RegEx (Regular Expressions) to remove characters you don't want. A good RegEx to search for would be one that finds all non-alphanumeric characters.