This is a console app to calculate monthly pay slip depends on annual income and tax rule.

1. Run npm install -g yarn in terminal to install yarn.

2. Run yarn install in terminal to build this app.

3. Run yarn start in terminal to run the app in the console.

4. Run yarn test in terminal to run the test.

1. Follow SOLID principle, try to make code readable, maintainable and reusable.

2. Create multiple functions, each function has a single responsibility.

3. Inject the dependency of taxRateTable to the function calculateEmployeeMonthlyPayslip, so that if the tax rate updated, only taxRateTable need to be changed. More maintainable and scalable.

4. CamelCase naming convention, comments and documentations to make code more readable.

5. Use yarn instead of npm because yarn is faster.