2695-Array-Wrapper.js

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

Easy

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



Runtime 51ms Beats71.59%of users with JavaScript
Memory 50.03MB Beats25.81%of users with JavaScript
*/


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

/**
 * @return {number}
 */
ArrayWrapper.prototype.valueOf = function() {
    let sum = 0;
    for(let n of this.nums){
        sum += n;
    }
    return sum;
}

/**
 * @return {string}
 */
ArrayWrapper.prototype.toString = function() {
    let s = "[";
    for(let i = 0; i < this.nums.length; i++){
        if(i != this.nums.length - 1){
            s += "" + this.nums[i] + ",";
        }
        else {
            s += this.nums[i];
        }
    }
    s += "]";
    return s;
}

/**
 * const obj1 = new ArrayWrapper([1,2]);
 * const obj2 = new ArrayWrapper([3,4]);
 * obj1 + obj2; // 10
 * String(obj1); // "[1,2]"
 * String(obj2); // "[3,4]"
 */