Valid Parentheses

/**
 * @param {string} str
 * @return {boolean}
 */
const isValid = function(str) {
  /*  
    if (typeof str !== 'string') {
      return false;
    }
  */
  const stack = [];
  const map = {
    ')': '(',
    '}': '{',
    ']': '['
  };

  for (const char of str) {
    if (Object.values(map).includes(char)) {
      stack.push(char);
    } else if (Object.keys(map).includes(char)) {
      if (map[char] !== stack[stack.length - 1]) {
        return false;
      }
      stack.pop();
    }
  }

  return stack.length === 0;
};

console.log(
  isValid('{{[test]})'), // false
  isValid('({[test]})'), // true
  isValid('({['), // false
  isValid(''), // true
);

/* You can verify the following cases as well, by uncommenting the if statement at the start of the method.
console.log(
  isValid(),            // false
  isValid(null),        // false
  isValid(0),           // false
  isValid(1),           // false
  isValid(1.12)         // false
);
*/

Demo