Valid Parentheses

/**
 * @param {string} s
 * @return {boolean}
 */
const isValid = function(s) {
  let stack = [],
      i = 0;

  while (i < s.length) {
    (s[i] == '}' && stack[stack.length - 1] == '{') ||
             (s[i] == ']' && stack[stack.length - 1] == '[') ||
             (s[i] == ')' && stack[stack.length - 1] == '(') ?
      stack.pop() : stack.push(s[i]);
    i += 1;
  }
  return stack.length == 0 ? true : false;
};