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2695. Array Wrapper
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].
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 <= 10000 <= nums[i] <= 1000Note: nums is the array passed to the constructor
Solutions
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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}]`; } } /** * const obj1 = new ArrayWrapper([1,2]); * const obj2 = new ArrayWrapper([3,4]); * obj1 + obj2; // 10 * String(obj1); // "[1,2]" * String(obj2); // "[3,4]" */