元素序列，但“join 不可用:调用 'joinWithSeparator()'"；错误

问题描述

当我尝试在操场上运行它时，为什么会在第 16 行(下面的最后一行)收到错误join isavailable: call the joinWithSeparator()"?而且，我该如何解决?

Why do I get the error "join is unavailable: call the joinWithSeparator()" at line 16 (the last line below) when I try to run it on playground? And, how can I fix it?

class Person {
    var firstName: String?
    var lastName: String?
    let gender = "female"

    func fullName() -> String {
        var parts: [String] = []

        if let firstName = self.firstName {
            parts += [firstName]
        }

        if let lastName = self.lastName {
            parts += [lastName]
        }
        return " ".join(parts)
    }
} 

推荐答案

错误消息告诉问题是什么，它告诉你如何解决它.阅读错误信息！执行错误消息所说的操作！

The error message tells you what the problem is, and it tells you how to fix it. Read the error message! Do what the error message says!

return parts.joinWithSeparator(" ")

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