Creating a 'const const' object in javascript [duplicate]

Question

In javascript, if I create a const array, I can still modify the object the variable points to:

// The const declaration creates a read-only reference to a value. 
// It does not mean the value it holds is immutable—just that the variable identifier cannot be reassigned.
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const
const x = [1,2,3];
x.push(4);
console.log(x);
x=55 // But this is illegal and will error
console.log(x);

Is there a way to make the elements in an array immutable as well? Similar to something like const int* const x; in C?

Answer 1

objects frozen with Object.freeze() are made immutable.

Here are the docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze

Example:

const x = [1,2,3];
Object.freeze(x);