Principles, Best Practices and Design Patterns for functional programming

Question

Are there any known principles, best-practices and design patterns that one can follow while writing code in a functional programming language?

Answer 1

Best practice: use algebraic data types and take advantage of exhaustiveness checking from the pattern-match compiler. In particular,

• Never match a wildcard pattern _ at top level.

• Set compiler options so that a missing case in a pattern match is an error, not a warning.