2618-check-if-object-instance-of-class.js

/**
 * 2618. Check if Object Instance of Class
 * https://leetcode.com/problems/check-if-object-instance-of-class/
 * Difficulty: Medium
 *
 * Write a function that checks if a given value is an instance of a given class or superclass.
 * For this problem, an object is considered an instance of a given class if that object has
 * access to that class's methods.
 *
 * There are no constraints on the data types that can be passed to the function. For example,
 * the value or the class could be undefined.
 */

/**
 * @param {*} obj
 * @param {*} classFunction
 * @return {boolean}
 */
var checkIfInstanceOf = function(obj, classFunction) {
  if (obj === null || obj === undefined || typeof classFunction !== 'function') {
    return false;
  }
  return Object(obj) instanceof classFunction;
};