AlgoDaily - Validate Palindrome

With a while loop:

We can cut down on the number of operations by recognizing that we don't need to do len(str)-1 iterations. Instead of using just one pointer that simply iterates through the string from its end, why not use two?

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function isPalindrome(str) {
  let left = 0;
  let right = str.length - 1;
  let leftChar;
  let rightChar;
​
  while (left < right) {
    leftChar = str.charAt(left);
    rightChar = str.charAt(right);
​
    if (leftChar == rightChar) {
      left++;
      right--;
    } else {
      return false;
    }
  }
​
  return true;
}
​
console.log(isPalindrome('racecar'));

OUTPUT

Results will appear here.