isPalindrome.js

// Create a function that checks if a given string is a palindrome.
// A palindrome is text that reads the same forwards and backwards, disregarding puncation, spaces, etc.

const testStrings = [
    "b",
    "aba",
    "abc", // FALSE
    "abba",
    "Race Car",
    "Mr. Owl ate my metal worm",
    "This is not a palindrome", // FALSE
    "Ya! Pizza zip pizazz! I pay.",
    "Doc, Note: I Dissent. A Fast Never Prevents A Fatness. I Diet On Cod.",
];


function isPalindrome(str) {
  let result;

  const cleanStr = str
    .toLowerCase()
    .match(/[A-Za-z]+/g)
    .join('');

  for (let index in cleanStr) {
    if (cleanStr[index] === cleanStr[(cleanStr.length - index) - 1]) {
      result = true;
    }
    else {
      result = false;

      break;
    }
  }

  return result;
}


// Test Strings
testStrings.forEach(function(str) {
  console.log(`isPalindrome:${isPalindrome(str)}`, str);
});

Nice! Using match to get to an array is cool.

I forked your gist to show you a way to get there without the for loop.

https://gist.github.com/johnnybenson/836416442ab067fe72cad894abd212f0