Object.Freeze Javascript
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I believe you're misunderstanding the concept of references in javascript. Objects are referenced in javascript, so when you do
const b = a;
basically you are assigning b a value of the reference a , in order to get your code to work, and actually "replicate" like you intend, you need to clone the object not pass a reference.
You can use Object.assign({}, ...) to clone an object into a new one. (notice that its not deep cloning but it should get you going)
let a = { "teste" : [1,2,3] }
// I want 'b' freezed
const b = Object.assign({}, a);
Object.freeze(b);
a.teste = [4,5,6]
console.log(a) Objects in Javascript are passed by reference, so in your example, the variables a and b refer to the same object. Object.freeze works on the object itself, not the reference, so there's no difference whether you refer to it using a or b . This is the same as if you'd just set a property:
let a = { "test" : [1,2,3] }
const b = a;
b.test = [4,5,6]
console.log(a)
If you want to freeze or modify b without affecting a , you'll need to clone it first. One way of doing this is using Object.assign :
let a = { "test" : [1,2,3] }
const b = Object.assign({}, a);
Object.freeze(b);
a.test = [4,5,6]
console.log(a)
This works by copying all of a 's properties to an empty object, then assigning that to b .