如何冻结 swift 中的数组？

Question

在 js 中，我可以在向数组添加一些元素后冻结数组。 Swift?

中有什么东西可以冻结数组吗？

What is freezing?

Ans: Suppose we have an array. We add some elements to that array.

/* This is javascript code */
var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Kiwi");
// fruits contains some elements

// Now freeze fruits. After freezing, no one can add, delete, modify this array.
Object.freeze(fruits);

我的问题在这里 - "Is there anything in swift where we can freeze an array?"

Answer 1

您可以创建数组的不可变副本，但对象的可变性仅由变量声明控制（let 不可变，var 可变），因此一旦创建可变对象，你不能让它不可变或 vice-versa.

var fruits = ["Banana", "Orange", "Apple", "Mango"]
fruits.append("Kiwi")

let finalFruits = fruits // Immutable copy
finalFruits.append("Pear") // Gives compile-time error: Cannot use mutating member on immutable value: 'finalFruits' is a 'let' constant

如何冻结 swift 中的数组？

How to freeze an array in swift?

arrays

immutability

swift