Algorithm
30 Days of JavaScript
Array Wrapper

2695. Array Wrapper

Tags

  • Classes

Link

https://leetcode.com/problems/array-wrapper/description/?envType=study-plan-v2&envId=30-days-of-javascript (opens in a new tab)

Question

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

Answer

JavaScript

/**
 * @param {number[]} nums
 * @return {void}
 */
var ArrayWrapper = function (nums) {
  this.nums = nums;
};
 
/**
 * @return {number}
 */
ArrayWrapper.prototype.valueOf = function () {
  return this.nums.reduce((accumulator, curr) => {
    accumulator += curr;
    return accumulator;
  }, 0);
};
 
/**
 * @return {string}
 */
ArrayWrapper.prototype.toString = function () {
  return "[" + this.nums.toString() + "]";
};
 
/**
 * const obj1 = new ArrayWrapper([1,2]);
 * const obj2 = new ArrayWrapper([3,4]);
 * obj1 + obj2; // 10
 * String(obj1); // "[1,2]"
 * String(obj2); // "[3,4]"
 */
/**
 * @param {number[]} nums
 */
var ArrayWrapper = function (nums) {
  this.nums = nums;
};
 
ArrayWrapper.prototype.valueOf = function () {
  return this.nums.reduce((sum, num) => sum + num, 0);
};
 
ArrayWrapper.prototype.toString = function () {
  return "[" + this.nums.join(",") + "]";
};
 
/**
 * const obj1 = new ArrayWrapper([1,2]);
 * const obj2 = new ArrayWrapper([3,4]);
 * obj1 + obj2; // 10
 * String(obj1); // "[1,2]"
 * String(obj2); // "[3,4]"
 */
Array Reduce TransformationCache with Time Limit