[Array] Array Wrapper (method, prototype 만들기) ⭐️

https://leetcode.com/problems/array-wrapper/description/

Array Wrapper - LeetCode

Create a class ArrayWrapper that accepts an array of integers in its constructor. This class should have two features:

• When two instances of this class are added together with the + operator, the resulting value is the sum of all the elements in both arrays.
• When the String() function is called on the instance, it will return a comma separated string surrounded by brackets. For example, [1,2,3].

 

Example 1:

Input: nums = [[1,2],[3,4]], operation = "Add"
Output: 10
Explanation:
const obj1 = new ArrayWrapper([1,2]);
const obj2 = new ArrayWrapper([3,4]);
obj1 + obj2; // 10

Example 2:

Input: nums = [[23,98,42,70]], operation = "String"
Output: "[23,98,42,70]"
Explanation:
const obj = new ArrayWrapper([23,98,42,70]);
String(obj); // "[23,98,42,70]"

Example 3:

Input: nums = [[],[]], operation = "Add"
Output: 0
Explanation:
const obj1 = new ArrayWrapper([]);
const obj2 = new ArrayWrapper([]);
obj1 + obj2; // 0

Constraints:

• 0 <= nums.length <= 1000
• 0 <= nums[i] <= 1000
• Note: nums is the array passed to the constructor

 

solution

/**
 * @param {number[]} nums
 */
var ArrayWrapper = function(nums) {
  this.nums = nums;
};

ArrayWrapper.prototype.valueOf = function() {
  return this.nums.reduce((a, b) => a + b, 0);
}

ArrayWrapper.prototype.toString = function() {
  return `[${this.nums.join(",")}]`;
}

 

solution2

class ArrayWrapper {
  constructor(nums) {
    this.nums = nums;
  }
  valueOf () {
    return this.nums.reduce((a, b) => a + b, 0);
  }
  toString () {
    return `[${this.nums.join(",")}]`;
  }
}