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 <h2><a href="https://leetcode.com/problems/array-prototype-last">2619. Array Prototype Last</a></h2><h3>Easy</h3><hr><p>Write code that enhances all arrays such that you can call the&nbsp;<code>array.last()</code>&nbsp;method on any array and it will return the last element. If there are no elements in the array, it should return&nbsp;<code>-1</code>.</p>
 <p>You may assume the array is the output of&nbsp;<code>JSON.parse</code>.</p>
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>
 <pre>
 <strong>Input:</strong> nums = [null, {}, 3]
 <strong>Output:</strong> 3
 <strong>Explanation:</strong> Calling nums.last() should return the last element: 3.
 </pre>
 <p><strong class="example">Example 2:</strong></p>
 <pre>
 <strong>Input:</strong> nums = []
 <strong>Output:</strong> -1
 <strong>Explanation:</strong> Because there are no elements, return -1.
 </pre>
 <p>&nbsp;</p>
 <p><strong>Constraints:</strong></p>
 <ul>
 	<li><code>arr</code> is a valid JSON array</li>
 	<li><code>0 &lt;= arr.length &lt;= 1000</code></li>
 </ul>