数组到字典（没有循环）

Question

假设我有这样的数组：

var array = ["zero","one","two", "three"]

我想将它转换为Dictionary，但键作为数组元素的索引，值是自己的元素：

var dic = [0:"zero", 1:"one", 2:"two", 3:"three"]

Answer 1

您可以使用Dictionary.uniqueKeysWithValues和zip的组合：

var array = ["zero","one","two", "three"]
var dict = Dictionary(uniqueKeysWithValues: zip(array.indices, array))
print(dict) // [0:"zero", 1:"one", 2:"two", 3:"three"]