mapLeft()

mapLeft<E, G>(f): <A>(fa) => Either<G, A>

Maps a function over the Left value of an Either.

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Type Parameters

E: E

The original error type.

G: G

The new error type.

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Parameters

f: (e) => G

The mapping function.

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Returns: <A>(fa): Either<G, A>

A function that transforms the Either.

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Since

2.0.0