import Deque from '../data-structures/deque';

export function palindromeChecker(aString) {
  if (
    aString === undefined
    || aString === null
    || (aString !== null && aString.length === 0)
  ) {
    return false;
  }
  const deque = new Deque();
  const lowerString = aString.toLocaleLowerCase().split(' ').join('');
  let firstChar;
  let lastChar;

  for (let i = 0; i < lowerString.length; i++) {
    deque.addBack(lowerString.charAt(i));
  }

  while (deque.size() > 1) {
    firstChar = deque.removeFront();
    lastChar = deque.removeBack();
    if (firstChar !== lastChar) {
      return false;
    }
  }

  return true;
}