====== Find longest word from a string ======

<note>
The string is trimmed to remove any leading or trailing whitespace and split into an array of words using the regex **/\s+/, which matches one or more whitespace characters**:
</note>

<note>
The function uses the **reduce** method on the array of words to find the longest word. The reduce method takes a callback function that compares the length of the current word to the length of the longest word found so far (maxWord):
<code javascript>
.reduce((maxWord, word) => {
    return word.length > maxWord.length ? word : maxWord;
}, '')
</code>
</note>

<code javascript longest-word-string.js>
function findLongestWord(string) {
    if (typeof string !== 'string' || string.trim().length === 0) {
        return '';
    }

    return string.trim().split(/\s+/).reduce((maxWord, word) => {
        return word.length > maxWord.length ? word : maxWord;
    }, '');
}

let longestWord = findLongestWord(" abc def ghiiii axiiii ");
console.log(longestWord); // Output: "ghiiii"
</code>