#2695 - Array Wrapper

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Problem Description

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].

Solution

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

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

/**
 * @return {string}
 */
ArrayWrapper.prototype.toString = function() {
  return JSON.stringify(this.nums);
};