README_en.md

7 simple rules for better code

1. Separate into another function when lines of a function are over one page

Based on a 12 "notebook, it's usually up to 25 lines including comments.

2. Separate into another function when an indentation is over two levels

When a for statement or an if statement occurs, think about it once again.

3. Separate into another function if you need to write comments

The block could be separated by semantics. Try to summarize the comments as a function name.

4. Separate into another module(file) or classes when you need to add data of a new type.

A program is basically a combination of data and algorithms process the data.

5. Use linting and formatting tool always

Recommended linting and formatting tools contain most of the best practices.

6. Start with a refactoring at least one line before adding or modifying functions.

It is also good to warm up brain

7. Start with just one test case

Even if it's not available now, it makes easy to add tests next time when adding, modifying, or refactoring your functions.