Debug Reducer, Ignoring Certain Actions

[rehatkathuria]

Building an app that interacts with the AV layer I have a scenario where an action is being fired 60 times a second. Debugging state on this reducer is very hard to do.

I'd love to see an addition to .debug() where I can also pass in an argument of Action... to be ignored in the logs

[iampatbrown]

Hey @rehatkathuria 👋

You could achieve this using .debug(state:action:) which takes a CasePath. Using Action... as an argument would probably only be suitable when the actions are Equatable without an associated value.

Here's an example:

struct State: Equatable { var value = "Blob" }

enum Action { case foo, bar, baz }

let reducer = Reducer<State, Action, Void>.empty.debug(
  state: { $0 },
  action: CasePath { $0 } extract: { action in
    switch action {
    case .foo, .bar: return action // debug
    case .baz: return nil // ignore
    }
  }
)

You could use this approach to create an extension that takes an Action... argument as well.

[rehatkathuria]

Ah, perfect, cheers @iampatbrown!