Palindrome Check

Write a function that takes in a non-empty string and that returns a boolean representing whether the string is a palindrome.

A palindrome is defined as a string that's written the same forward and backward. Note that single-character strings are palindromes.

Sample Input string = "abcdcba" Sample Output true

def isPalindrome(string):
  # Write your code here.
  lastIdx = len(string) - 1
  for i in range(len(string)):
    if lastIdx <= i:
      return True
    if string[i] != string[lastIdx]:
      return False
    else:
      lastIdx -= 1

function isPalindrome(string) {
  // Write your code here.
  let lastIdx = string.length - 1;
  for (let i = 0; i < string.length; i++) {
    if (lastIdx <= i) {
      return true;
    }
    if (string[i] !== string[lastIdx]) {
      return false;
    } else {
      lastIdx--;
    }
  }
}