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The ExpenseReport legacy code refactoring example in various languages

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ExpenseReport

The ExpenseReport legacy code refactoring kata in various languages.

This is an example of a piece of legacy code with lots of code smells. The goal is to support the following new feature as best as you can:

  • Add Lunch with an expense limit of 2000.

Process

  1. 📚 Read the code to understand what it does and how it works.
  2. 🦨 Read the code and check for design smells.
  3. 🧑‍🔬 Analyze what you would have to change to implement the new requirement without refactoring the code.
  4. 🧪 Write a characterization test. Take note of all design smells that you missed that made your life writing a test miserable.
  5. 🔧 Refactor the code.
  6. 🔧 Refactor the test.
  7. 👼 Test-drive the new feature.

Supported Languages

The ExpenseReport example currently exists in the following languages:

Planned languages

(in no particular order and with no guarantee)

  • ABAP
  • Amiga E
  • AMOS
  • Assembler (m68k-amigaos) (if there is demand, I could add a few more, like arm-linux, aarch64-linux, i686-linux, amd64-linux)
  • Eiffel
  • Elm
  • Erlang
  • Forth
  • Logo
  • Modula-2 (once the linker starts working again)
  • Oberon
  • OCaml
  • R
  • Scratch
  • WebAssembly
  • zsh

Languages explicitly not planned

  • Brainfuck
  • Malbolge
  • Whitespace

Solutions

To see solutions, switch to the branch solutions.

Warning The solutions branch will be rebased!

Credits

I first encountered the ExpenseReport example during a bootcamp at Equal Experts. I also have seen the ExpenseReport example being used by Robert "Uncle Bob" C. Martin. I have tried to research its origins but so far I have failed. If you know who has first come up with this example, please get in touch with me.

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