Swift:如何将数组中的元素换成1？

Question

我有6种不同颜色的数组:

var colorList: [String] = ["blue", "green", "purple", "red", "yellow", "orange"]

我正在尝试创建一个函数,将每个元素向右移动一个,如下所示:

["orange", "blue", "green", "purple", "red", "yellow"]

我该怎么做呢？

Answer 1

colorList.insert(colorList.popLast()!, atIndex: 0)

或作为Array的扩展

extension Array {
    mutating func shiftRight() {
        if let obj = self.popLast(){
            self.insert(obj, atIndex: 0)
        }
    }
}

var colorList: [String] = ["blue", "green", "purple", "red", "yellow", "orange"]
colorList.shiftRight()
print(colorList)

结果是

["orange", "blue", "green", "purple", "red", "yellow"]