Why "for-in" loop doesn't iterate through the prototype properties?
javascript
Solution
As many said in the comments, the For-In loop enumerates only the enumerable properties in the prototype chain, and the inherited `toString` property is not enumerable.
If you want to iterate through the non-enumerable properties of the `object` prototype to see if "ToString" is there then you should get the object prototype and get its enumerable and non-enumerable properties using the `getOwnPropertyNames` method:
var dict = {};
var objPrototype = Object.getPrototypeOf(dict);
var propertyNames = Object.getOwnPropertyNames(objPrototype);
propertyNames.length;
Problem
Let's create a new object: ``` var dict = {}; ``` Known fact is that after creating a new object, this new object inherits the `Object.prototype` . So when I try to check if the prototype's properties were inherited I do `"toString" in obj` for which I get `true`. But when I want to put all the properties of the newly created object into an array I would see that the array is empty after finishing filling up. Have a look on the code below: ``` var names = []; for (var name in dict) { names.push(name); }; names.length; ``` Fail to see why it happens.