2704-To-Be-Or-Not-To-Be.js

/**
 *
 * Write a function expect that helps developers test their code. It should take in any value val and return an object with the following two functions.
 *
 * toBe(val) accepts another value and returns true if the two values === each other. If they are not equal, it should throw an error "Not Equal".
 * notToBe(val) accepts another value and returns true if the two values !== each other. If they are equal, it should throw an error "Equal".
 *
 * Example 1:
 *
 * Input: func = () => expect(5).toBe(5)
 * Output: {"value": true}
 * Explanation: 5 === 5 so this expression returns true.
 *
 * Example 2:
 *
 * Input: func = () => expect(5).toBe(null)
 * Output: {"error": "Not Equal"}
 * Explanation: 5 !== null so this expression throw the error "Not Equal".
 *
 * Example 3:
 *
 * Input: func = () => expect(5).notToBe(null)
 * Output: {"value": true}
 * Explanation: 5 !== null so this expression returns true.
 *
 */

/**
 * @param {string} val
 * @return {Object}
 */
var expect = function (val) {
  return {
    toBe: function (val2) {
      if (val === val2) {
        return true;
      } else {
        throw new Error("Not Equal");
      }
    },
    notToBe: function (val2) {
      if (val !== val2) {
        return true;
      } else {
        throw new Error("Equal");
      }
    },
  };
};

/**
 * expect(5).toBe(5); // true
 * expect(5).notToBe(5); // throws "Equal"
 */