2619. Array Prototype Last

tags: leetcode 30 days js challenge Easy

2619. Array Prototype Last

題目描述

Write code that enhances all arrays such that you can call the array.last() method on any array and it will return the last element. If there are no elements in the array, it should return -1.

範例

Example 1:

Input: nums = [1,2,3]
Output: 3
Explanation: Calling nums.last() should return the last element: 3.

Example 2:

Input: nums = []
Output: -1
Explanation: Because there are no elements, return -1.

Constraints:

• 0 <= arr.length <= 1000
• 0 <= arr[i] <= 1000

解答

TypeScript

declare global {
  interface Array<T> {
    last(): T | -1;
  }
}

Array.prototype.last = function() {
  return this.length === 0 ? -1 : this[this.length - 1];
};

SheepSat, May 27, 2023

Reference

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