swift - 打印时如何去掉数组括号

Question

打印数组时如何去除左右括号？

var array = ["1", "2", "3", "4"]
println("\(array)") //It prints [1, 2, 3, 4]

var arrayWithoutBracketsAndCommas = array. //some code

println("\(arrayWithoutBracketsAndCommas)") //prints 1 2 3 4

Answer 1

你可以这样做:

extension Array {
    var minimalDescription: String {
        return " ".join(map { "\($0)" })
    }
}

["1", "2", "3", "4"].minimalDescription // "1 2 3 4"

---

在 Swift 2 中，使用 Xcode b6，SequenceType 上出现了 joinWithSeparator 方法:

extension SequenceType where Generator.Element == String {
    ...
    public func joinWithSeparator(separator: String) -> String
}

意思是你可以这样做:

extension SequenceType {
    var minimalDescrption: String {
        return map { String($0) }.joinWithSeparator(" ")
    }
}

[1, 2, 3, 4].minimalDescrption // "1 2 3 4"

swift 3:

extension Sequence {
    var minimalDescription: String {
        return map { "\($0)" }.joined(separator: " ")
    }
}