LeetCode's Length of Last Word Challenge

Given a string s consisting of words and spaces,
return the length of the last word in the string.
A word is a maximal substring consisting of non-space characters only.

javascript/lengthOfLastWord.js

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+/**
+ * Visit https://leetcode.com/problems/length-of-last-word/description/
+ * for full problem description
+ * 
+ * Given a string s consisting of words and spaces, 
+ * return the length of the last word in the string.
+ * A word is a maximal substring consisting of non-space characters only.
+ * 
+ * @param {string} s
+ * @return {number}
+ */
+var lengthOfLastWord = function (s) {
+    // Remove white spaces at both ends of the string
+    // This ensures that the string ends with a word
+    const sTrimmed = s.trim();
+    // Put substrings separated by one whitespace ' ' into an array
+    const sArray = sTrimmed.split(' ');
+    // Return the length of the last element in the array
+    return sArray[sArray.length - 1].length;
+
+};