我们如何才能像具有Object.freeze（）方法的对象那样使Javascript数组不可变？

Question

For ex: 例如：

const arr = [1,2,3];
arr.push(4);    //4
console.log(arr) //[1,2,3,4]

I want this array to be immutable. 我希望这个数组是不可变的。 It should not allow push or add/delete arr values. 它不应允许推入或添加/删除arr值。

Answer 1

Object.freeze works just fine on arrays, since arrays are objects as well: Object.freeze在数组上也可以正常工作，因为数组也是对象：

 const arr = [1,2,3]; Object.freeze(arr); arr.push(4); // attempting to push throws

Answer 2

Arrays are objects - so it'll work fine: 数组是对象-因此可以正常工作：

 const arr = [1, 2, 3]; Object.freeze(arr); arr.push(4); arr[arr.length - 1] = 4;

The index assignment method also fails: 索引分配方法也将失败：

 const arr = [1, 2, 3]; Object.freeze(arr); arr[arr.length - 1] = 4;

Answer 3

Yes you can Freeze array 是的，您可以Freeze array

 const arr = [1,2,3]; Object.freeze(arr) arr.push(5);

Note:- it will do shallow freeze, 注意：-它会进行浅层冻结，

 const arr = [1, 2, {key: 123}]; Object.freeze(arr) arr[2].key = 'changed value' console.log(arr)