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2695. Array Wrapper

Description

Create a class ArrayWrapper that accepts an array of integers in it's 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

Solutions

  • class ArrayWrapper {
        private nums: number[];
        private s: number;
    
        constructor(nums: number[]) {
            this.nums = nums;
            this.s = nums.reduce((a, b) => a + b, 0);
        }
    
        valueOf() {
            return this.s;
        }
    
        toString() {
            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]"
     */
    
    

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