让非可变数组迅速 [英] let Non-mutable array in swift

问题描述

let 类型变量应该是常量，但是以后重新分配值不会引发任何错误.

let type variable are supposed to be constants, but reassign a value later does not throw any error.

如何创建一个非可变数组.

How do I create a non-mutable array.

  let testArray = ["Catfish","water","tulips"]
  print(testArray[1])
  testArray[1] = "bottle of water"
  print(testArray[1])

输出是一瓶水"

推荐答案

您不是在重新声明数组本身，而是在重新声明数组的元素.在Swift中是允许的.当前没有一种使数组中所有元素不变的方法.不过，应该在未来更新中进行更改.

You aren't reassinging the array itself, but an element of the array. This is allowed in Swift. There isn't currently a way to make all of the elements in the array immutable. It should be changed in a future update though.

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You may also want to take a look at this. Arrays have interesting assignment and copying behavior in Swift.

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