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• either-core-jvm
• 0.1.0-alpha.2
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• EitherMap.kt

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commonMain.extensions.EitherMap.kt Maven / Gradle / Ivy

package com.javiersc.either.extensions

import com.javiersc.either.Either

/** Map an Either to another completely different Either */
public fun  Either.map(
    left: (L) -> NL,
    right: (R) -> NR,
): Either =
    when (this) {
        is Either.Left -> Either.Left(left(this.left))
        is Either.Right -> Either.Right(right(this.right))
    }

/** Map left part of an Either with the same Right type */
public fun  Either.mapLeft(
    left: (L) -> NL,
): Either =
    when (this) {
        is Either.Left -> Either.Left(left(this.left))
        is Either.Right -> this
    }

/** Map right part of an Either with the same Left type */
public fun  Either.mapRight(
    right: (R) -> NR,
): Either =
    when (this) {
        is Either.Left -> this
        is Either.Right -> Either.Right(right(this.right))
    }