Callback mechanism

Hacker Rank Problem - CutTheSticks

Hacker Rank Problem - Apple and Orange...

Hacker Rank Problem - Number Line Jump...

Visitor Design Pattern by Ridit

And here goes my impromptu discussion on the Visitor Design Pattern implemented in Python...

#Enjoy...

Mediator Pattern Explained in Python,Java and C++...

Here goes the training video

Memento Design Pattern By Ridit

Here goes my video session discussing Memento Design Pattern.