You'll need Node installed. I used v8.1.2.

$ git clone [email protected]:keithbro/code_test.git

$ cd code_test

$ npm install

$ npm test # (uses mocha)

$ ./scripts/payThisWeek.js

Ebony Boycott will get paid $2604.0735 this week
Geoff Rainford-Brent will get paid $1119.026336 this week
Meg Gillespie will get paid $1125 this week
Jason Lanning will get paid $160.022 this week

$ ./scripts/paymentReport.js

# Outputs each payment that a person should have received since their
# injury until now.

• Better input validation! Currently the JSON files must be in the correct format and if they are not you would probably get an ugly error message.
• Possibly split out calculator.js in to multiple modules, one focused on rules, and another focused on people. Might even be worth turning them in to proper classes, but I went for a more functional approach instead.
• Move the "scripts" in to their own module so that they can be unit tested.

• Accuracy of calculations. I used Big.js to avoid rounding errors due to working with arbitrary precision decimals.
• I felt that the mathematical nature of the problem was suited to a functional approach. I focussed on writing small functions and composing them to implement the desired functionality. It was for these reasons that I decided to use JavaScript and the Ramda functional library.
• Testing. I decided up front which functions I wanted to write and I wrote the tests before writing the implementation.