code refactoring

Refactoring Code

In the software companies, there will be times when old software code (also legacy code) needs to re-written with newer optimizations and syntax. This does not add a new feature but improves the working of the existing code. This process is called as refactoring code.

Advantages of refactoring

Improved code readability
Reduced code complexity
Improved performance
Coding style compliance

At then end the goal is to achieve simpler, cleaner, faster and code compliant code without changing user functionality.

Refactoring practical

Goal of the module is to fix problems with the existing code and refactor the code.

The module provides 2 sample example code in 2 coding languages (CPP & Python)

Get the workspace for refactoring
- Download the ready to use workspace for refactoring - https://gitlab.iotiot.in/newbies/pre-office-office/refactoring-workspace/-/archive/master/refactoring-workspace-master.zip
- Unzip the refactoring-workspace-master.zip
- Open VScode.
- Press Ctrl + Shift + p in VScode. A bar will open up at the top.
- Search for Remote-Containers
- Click on "Remote-Containers: Open Folder in Containers".
- In the pop up Window, Navigate to Downloads --> refactoring-workspace-master
- Click on Open.
- Vscode will take some time to start up the container, once done
- Open up terminal by Pressing Ctrl + j.
- That is it done you have successfully opened up the workspace. Now you can get to refactoring.
Fork the refactoring repository.
- Go to link - https://gitlab.iotiot.in/newbies/pre-office-office/refactoring-trial
- Click on Fork.
- Select your username in the next window.
- The repo will fork and you should be directed to your own copy of the original repository.
Clone the repository.
- Copy Repository URL from the
- Go to your VScode which has the refactoring workspace opened.
- Type git clone {your-repository-URL-here} in the terminal. (for ex: git clone https://gitlab.iotiot.in/yh42/refactoring-trial)
- Type cd refactoring-trial and open up the repository.
Choose a coding language Python or CPP to refactor code. (choose the language that you are most comfortable with)
- Type cd codestyle/{language} (for ex: cd codestyle/cpp)
Choose any one sample code to refactor. There are 2 sample codes
1. yhatzee-game - Click here to read code doc
2. tennis - Click here to read code doc
Check coding style of the codes
- For python
  Click to see your steps!
  - Make sure that you are in the folder codestyle/python, Check by running command pwd
  - Type cd {your-chosen-example} in VScode terminal. (for ex: cd tennis)
  - Run command
    - For Tennis pycodestyle tennis.py
    - For yhatzee-game pycodestyle yahtzee.py
  - After running the command you will get a big list of errors in the coding style.
- For CPP
  Click to see your steps!
  - Make sure that you are in the folder codestyle/cpp, Check by running command pwd
  - Type cd {your-chosen-example} in VScode terminal. (for ex: cd tennis)
  - Run commands
```
mkdir build 
cd build 
cmake ../
make codestyle
```
  - After running the command you will get a big list of errors in the coding style.
Make changes to the code
- For Python Example
  Click to see your steps!
  - Lets try to solve first 4 errors thrown by the codestyle check
  - There seems to be errors due to spaces in the code, Lets fix these errors
  - After fixing the errors the codestyle does not throw the errors anymore
  - Yay! the code has been refactored, Now test it so that it clears all the tests.
- For CPP Example
  Click to see your steps!
  - Lets try to solve first 4 errors thrown by the codestyle check
  - There seems to be errors, due brackets missing in if condition, Lets fix these errors
  - After fixing the errors the codestyle does not throw the errors anymore
  - Yay! the code has been refactored, Now test it so that it clears all the tests.
Test if your refactored code passes all the tests.
- For Python
  Click to see your steps!
  - Run command pytest
  - You will see your refactored code get tested. If anything fails the test will report the failure.
- For CPP
  Click to see your steps!
  - For Tennis example, run commands
```
make
./tennis1_tests
```
  - For yhatzee-game, run commands
```
make
./yahtzee_tests
```
  - You will see your refactored code get tested. If anything fails the test will report the failure.
Repeat the steps 6, 7, 8 till all the code style errors are solved.

Submit the changes.

Run commands

cd /home/shunya/refactoring-trial
git config --global user.name "{Your-name}" 
#(for ex: `git config --global user.name "Yogesh Hegde"`)
git config --global user.email "{your-email-id}" 
#(for ex: `git config --global user.email "yogesh@iotiot.in"`)
git add .
git commit -m "refactored code"
git push

See your code Build, Test and Deploy via CI/CD.
- Go to your repository (the one that you have forked), CI/CD --> Pipelines.
- You can see Build, Test and Deploy devOps stages passing.
- Click on the passed to see all the individual stage summary.
Thats is it done, you have successfully Refactored your code and see it Built, Tested and Deployed via CI/CD.