[LeetCode 2704] To Be Or Not To Be

문제

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".

출력 예시

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.

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필요 사전 지식

사실 object를 직접 생성해서 써본 적은 없었는데.. 누가 Object 만들어서 쓰는 방법을 Discussion에 올려줬다.

object 생성

• 방법 1

let object = {
    method1: function(arg1) {
        // some code
    },
    method2: function(arg2) {
        // some code
    }
};
return object

• 방법 2

let object = new Object();
object.method1 = function(arg) {
      // some code
}
object.method2 = function(arg) {
      // some code
}
return object

함수 생성

• 방법 1

functionNameOne: function(arg) => {
    // do something.. return something..
}

• 방법 2

functionNameOne(arg) {
    // do something.. return something..
}

• 방법 3

functionNameOne: (arg) => returnValue

error 출력

throw new Error("message");

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풀이

/**
 * @param {string} val
 * @return {Object}
 */

var expect = function(val) {
    let object = {
        toBe: function(arg1) {
            if (arg1 === val) {
                return true
            } else {
                throw new Error("Not Equal");
            }
        },
        notToBe: function(arg2) {
            if (arg2 !== val) {
                return true
            } else {
                throw new Error("Equal");
            }
        }
    };
return object
};