Question 29: check for null

[vibl]

In "Question 29. Write a function called deepClone which takes an object and creates a object copy of it.", the deepClone function should check for a null value:

if( typeof object[key] === 'object' && object[key] !== null )...

What's more, we usually want to also check for hasOwnProperty().

[ganqqwerty]

fixed check for null. About hasownproperty I'm not that sure...