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OOP and SOLID

1. OOP

Countdown

  1. Create a class called Counter
  2. Create a instance variable called value. Initialize it to 0
  3. Implement a incr method which increments value by 1
  4. Implement a decr method which decrements value by 1
  5. Implement a incrby method which accepts a integer, n and increments value by n
  6. Implement a decrby method which accepts a integer, n and decrements value by n

Triangle and points

Create a Triangle class.

Initially this class will have an empty list of points. Add a add_point method which adds the point to the list of points. Add a perimeter method which calculates the perimeter of a triangle. Add a is_equal method which accepts another triangle object as an argument and checks whether the two triangles have the same list of points.

Create a triangle object, t1 and add the following points:

0, 0 0, 3 4, 0

Find its perimeter

Create another triangle object, t2 with the following points:

1, 2 2, 1 1, 5

Find its perimeter

Check whether t1 and t2 are equal

Create another triangle object, t3, with the following points:

1, 2
2, 1
1, 5

Do the following operations:

t1 == t3
t1.is_equal(t3)
t3.is_equal(t1)

Rename is_equal to __eq__:

Do the following operations

t1 == t3

2. SOLID

Data Munging Problem

Practice Data Munging problem (http://codekata.com/kata/kata04-data-munging).

Spike out the first version just make it work.

What is a spike?

A spike is used to determine how much work will be required to solve or work around a software issue. Typically, a "spike test" involves gathering additional information or testing for easily reproduced edge cases.

https://en.wikipedia.org/wiki/Spike_(software_development)

In the second version:

Create proper classes. Try to apply OOPs concepts and do it using minimum amount of code.

Check your work - total 5 files

  • Create a DataExtractor class - which only extracts data. Pass arguments to customize
  • Create a DataAnalyzer class - which only calculates the min diff. Pass arguments to customize.
  • Create a Calculator class - which initializes the two classes above and executes.
  • Soccer and Weather files - Create objects of Calculator class and pass arguments. Make sure you use named variables for column names. Do not pass 6 directly.