var validPalindrome = function(s) { let start = 0; let end = s.length - 1; while (start < end) { if (s[start] !== s[end]) { return validSubPalindrome(s, start + 1, end) || validSubPalindrome(s, start, end - 1); } start++; end--; } return true; }; var validSubPalindrome = function(s, start, end) { while (start < end) { if (s[start] !== s[end]) { return false; } start++; end--; } return true; };