Please do the sample questions if you really want to learn this stuff

I see this problem all too often in stack overflow: a situation where folks check for the type of a class in an if statement, and then respond accordingly. Rather than repeating myself a million times, I thought it much easier just to write a post on the subject (DRY FTW!). Anyways, this type of code (pun intended) smacks of a duck type not being identified and utilised.

Imagine you have two classes. A parent and a child class. The child inheritance from the parent. Therefore the child should be able to do everything that a parent does and possibly more.

Last post we looked at dependencies and isolating them. This post we are going to work through some exercises.

Managing Dependencies

In a post a few weeks back I was griping about the limitations of Tekla. Ideally I’d want to resort to enums to get access to a particular property. But Tekla forces you to use strings directly to query for the property you are after. This is a minor inconvenience. So I devoted three hours of my life in the service of the public to ensure that nobody suffers anymore.

So I have a JSON string that I want to parse into a JSON object: