Hi there!. Is there something similar to tap function in Arrow? that is execute a side effect action...

# arrow

[Alvaro Blazquez checa]

Hi there!. Is there something similar to tap function in Arrow? that is execute a side effect action with the value of a container and return the input of the original container.
Example:

getResultFromDatabase().tap { result ->
  log(result)
}.map { result ->
  transformDatabaseResult()
}

[Alvaro Blazquez checa]

I know it can be done using map and returning the same input as output but tap is making clearer that there is a side effect there

[Alvaro Blazquez checa]

Untitled.txt

[simon.vergauwen]

Hey @Alvaro Blazquez checa,

Yes, there is tap and tapLeft available on Either for example. It should also be present on the other data types, if not feel free to create a ticket or raise a PR 😉

https://github.com/arrow-kt/arrow/blob/main/arrow-libs/core/arrow-core/src/commonMain/kotlin/arrow/core/Either.kt#L853

[Alvaro Blazquez checa]

Great Simon. thx!

[carbaj0]

very interesting the tap function, I always have been using map...

[simon.vergauwen]

It’s been only recently added. Right before 1.0 @carbaj0