Hi, is there a given pattern on when (and when not...

# announcements

[nbaztec]

Hi, is there a given pattern on when (and when not) to use check functions? We have a use-case where we'd like to throw a concrete custom Exception. What would be the ideal way to do it?

Wrap it later, but use check

try {
  check(<exp>){ "check failed"}
}  catch(e: IllegalStateException) {
  throw CustomException(e)
}

or throw it directly,

if (<exp>) {
  throw CustomException("check failed)
}

[df]

Throwing it directly. There is no advantage in throwing the IllegalStateException first, catching it and then throwing another one. You should use check to validate the state of the object.

[Vampire]

You can also make an own top-level function like check that throws the exception you want if you prefer the syntax of check instead of an if with throw