Best practices

• Separation of concerns - Each section of a program addresses a specific, distinct feature and these features are kept separate.

• Principle of least privilege - Code should only have access to what it needs to have access to.

• Principle of least surprise - The layout or functionality of the code is what the reader would expect.

• Libraries - It's good to use libraries instead of implementing something yourself.

• Explicit import - Instead of importing an entire module, list the functions you want to use.

• Explicit export - When writing a module, only export the functions you want to be accessible.

• Do not write partial functions - Functions like head may sometimes throw an error instead of returning a value. Write functions which return a value wrapped in Maybe or Either instead.