knomadic/nz.adjmunro.knomadic.util/andThen

andThen

inline fun <I, O> KotlinResult<I>.andThen(onSuccess: (I) -> O): KotlinResult<O>

Transforms value inside a resultOf scope.

Success ->wraps&returns the result of onSuccess transformation.
Failure ->wraps&returns the original Throwable.
If onSuccess throws an exception, it will be caught & wrapped by resultOf.

This is the resultOf alternative to Result.mapCatching.

resultOf { 4 }
  .andThen { it * 2 } // KotlinResult.success(8)
  .andThen { check(false) { it } } // KotlinResult.failure(IllegalStateException("4"))
  .andThen { 16 } //  RemainsKotlinResult.failure(IllegalStateException("4"))

andThen

See also