In this episode, we look at various questions asked during interviews.

In this episode, we look at the Liskov Substitution Principle. If S is a subtype of T, then objects of type T may be replaced with objects of type S without altering any of the desirable properties of the program.

Open/Closed principle states "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification"; that is, such an entity can allow its behaviour to be extended without modifying its code.

We may come across a need to run shell commands and Ruby has some built in methods which appear safe, but can introduce major security risks.

Sometimes we find ourselves in a situation where we are handling the releases for an important application in our organization, but with each release, a regression/happy path testing must occur. We can use Ruby and Capybara to test these external sites.