Find the longest word in string (Swift 4)

gistfile1.txt

func findLongestWord(word: String) -> String {
    let wordArray = word.components(separatedBy: " ")
    var maxLength = 0
    
    for index in 0..<(wordArray.count) {
        if wordArray[index].count > maxLength {
            maxLength = wordArray[index].count
        }
    }
    
    return "\(maxLength)"
}

findLongestWord(word: "The quick brown fox jumped over the lazy dog")

Optimized code:

func findLongestWord(word: String) -> String? {
    if let longestWord = word.components(separatedBy: " ").max(by: { $1.count > $0.count }) {
        return longestWord
    }
    
    return nil
}

let longestWord = findLongestWord(word: "The quick brown fox jumped over the lazy dog")
print(longestWord?.count)