Creating new objects from frozen parent objects

Question

This example creates an object, freezes it, and then creates a new object from the frozen object. If the second object tries to change the test property, it can\'t. It remai

Answer 1

In your case second is a reference to first (like you assumed). A solution would be to clone your object. There is no build in way to clone objects - you have to do it yourself, here is how (source):

function clone(obj){
   if(obj == null || typeof(obj) != 'object')
      return obj;

   var temp = obj.constructor();

   for(var key in obj)
       temp[key] = clone(obj[key]);
   return temp;
}

Then you use it this way:

var first = {
    test: 10
};
Object.freeze(first);

// clone it into a new one
var second = clone(first);
second.test = 20;
console.log(second.test); // 20 where the first is locked