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Scala Best Practices


Keep it simple

Do not overcomplicate simple tasks. Most of the time you will need only:

• algebraic datatypes

• structural recursion

• monad-like api (map, flatMap, fold)

There is plenty of complicated stuff in Scala, such as:

• Cake pattern or Reader Monad for Dependency Injection.

• Passing arbitrary values as implicit arguments.

These things are not clear for newcomers: avoid using them before you understand them. Using advanced concepts without a real need obfuscates the code, making it less maintainable.

Don't pack too much in one expression.

• Find meaningful names for computation units.

• Use for comprehensions or map to combine computations together.

Let's say you have something like this:

if (userAuthorized.nonEmtpy) {
 makeRequest().map {
 case Success(respone) =>
 if (resendToUser) {

If all your functions return Either or another Validation-like type, you can write:

for {
 user <- authorizeUser
 response <- requestToThirdParty(user)
 _ <- someProcessing(...)
} {


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