Array Wrapper.js

// 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


//code 


var ArrayWrapper = function(nums) {
    this.nums = nums; // Store the array
};

/**
 * @return {number}
 */
ArrayWrapper.prototype.valueOf = function() {
    return this.nums.reduce((sum, num) => sum + num, 0); // Sum all elements
};

/**
 * @return {string}
 */
ArrayWrapper.prototype.toString = function() {
    return `[${this.nums.join(",")}]`; // Convert array to string format [1,2,3]
};