58. 最后一个单词的长度

Show me the code

class Solution {
    func lengthOfLastWord(_ s: String) -> Int {
        s.trimmingCharacters(in: .whitespacesAndNewlines).components(separatedBy: CharacterSet.whitespaces).last?.count ?? 0
    }
}

注意点

// print: ["", "", "", "fly", "me", "", "", "to", "", "", "the", "moon", "", ""]
print("   fly me   to   the moon  ".components(separatedBy: CharacterSet.whitespaces))

运行结果