Earlier, we saw that even if you create objects with const in front of them, a programmer is still able to modify its properties. This is because const creates an immutable binding, that is, you cannot assign a new value to the binding.
Therefore, in order to truly make objects constants (that is, unmodifiable properties), we have to use something called Object.freeze. However, Object.freeze is, again, a shallow method, that is, you need to recursively apply it on nested objects to protect them. Let's clear this up with a simple example.
Consider this example:
var ob1 = { prop1 : 1, prop2 : { prop2_1 : 2 }};Object.freeze( ob1 );const ob2 = { prop1 : 1, prop2 : { prop2_1 : 2 }}ob1.prop1 = 4; // (frozen) ob1.prop1 ...
