49 lines
1.7 KiB
Kotlin
49 lines
1.7 KiB
Kotlin
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package com.mikebull94.result
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/**
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* - Elm: [Result.map](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#map)
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* - Haskell: [Data.Bifunctor.first](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:first)
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*/
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inline fun <V, E, U> Result<V, E>.map(transform: (V) -> U): Result<U, E> {
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return when (this) {
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is Ok -> ok(transform(value))
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is Error -> error(error)
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}
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}
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/**
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* - Elm: [Result.mapError](http://package.elm-lang.org/packages/elm-lang/core/latest/Result#mapError)
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* - Haskell: [Data.Bifunctor.right](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:second)
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*/
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inline fun <V, E, U> Result<V, E>.mapError(transform: (E) -> U): Result<V, U> {
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return when (this) {
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is Ok -> ok(value)
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is Error -> error(transform(error))
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}
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}
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/**
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* - Elm: [Result.Extra.mapBoth](http://package.elm-lang.org/packages/circuithub/elm-result-extra/1.4.0/Result-Extra#mapBoth)
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* - Haskell: [Data.Either.either](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Either.html#v:either)
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*/
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inline fun <V, E, U> Result<V, E>.mapBoth(success: (V) -> U, failure: (E) -> U): U {
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return when (this) {
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is Ok -> success(value)
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is Error -> failure(error)
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}
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}
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// TODO: better name?
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/**
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* - Haskell: [Data.Bifunctor.Bimap](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Bifunctor.html#v:bimap)
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*/
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inline fun <V1, V2, E1, E2> Result<V1, E1>.mapEither(
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okTransform: (V1) -> V2,
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errorTransform: (E1) -> E2
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): Result<V2, E2> {
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return when (this) {
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is Ok -> ok(okTransform(value))
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is Error -> error(errorTransform(error))
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}
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}
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