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leetcode/problem/array-prototype-last.html

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+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>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [1,2,3]
+<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>0 &lt;= arr.length &lt;= 1000</code></li>
+	<li><code>0 &lt;= arr[i] &lt;= 1000</code></li>
+</ul>