Exploring Palindrome String Problem in JavaScript

Palindrome Challenge:

A palindrome is a sequence of characters that remains unchanged when read backwards.

Given a string, return true if it is a palindrome, and false otherwise.

For example
"racecar," "madam," and "12321" are palindromes.
"hello," "world," and "12345" are not.

Notes:
A palindrome can be a word, phrase, number, or any combination thereof.
If characters are supplied, assume it's lower case.