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Make ApplicativeError#catch have bias to the right #1063

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merged 1 commit into from Oct 23, 2018
Merged

Make ApplicativeError#catch have bias to the right #1063

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4 changes: 2 additions & 2 deletions modules/core/arrow-typeclasses/src/main/kotlin/arrow/typeclasses/ApplicativeError.kt
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Expand Up @@ -26,13 +26,13 @@ interface ApplicativeError<F, E> : Applicative<F> {
fun <A> fromEither(fab: Either<E, A>): Kind<F, A> =
fab.fold({ raiseError<A>(it) }, { just(it) })

fun <A> catch(f: () -> A, recover: (Throwable) -> E): Kind<F, A> =
fun <A> catch(recover: (Throwable) -> E, f: () -> A): Kind<F, A> =
try {
just(f())
} catch (t: Throwable) {
raiseError<A>(recover(t))
}

fun <A> ApplicativeError<F, Throwable>.catch(f: () -> A): Kind<F, A> =
catch(f, ::identity)
catch(::identity, f)
}
4 changes: 2 additions & 2 deletions modules/docs/arrow-docs/docs/docs/typeclasses/applicativeerror/README.md
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Expand Up @@ -111,11 +111,11 @@ Constructor function. It takes two function parameters. The first is a generator
`catch()` runs the generator function to generate a success datatype, and if it throws an exception it uses the error mapping function to create a new failure datatype.

```kotlin:ank
eitherAE.catch({ 1 } ,::identity)
eitherAE.catch(::identity) { 1 }
```

```kotlin:ank
eitherAE.catch({ throw RuntimeException("Boom") } ,::identity)
eitherAE.catch(::identity) { throw RuntimeException("Boom") }
```

### Laws
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