fold()

const fold: <E, A, B>(onLeft, onRight) => (ma) => B = match

Alias for match.

Pattern matches on an Either.

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Type Parameters

E: E

The error type.

A: A

The success type.

B: B

The return type.

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Parameters

onLeft: (e) => B

Handler for Left case.

onRight: (a) => B

Handler for Right case.

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Returns

A function that takes an Either and returns B.

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Since

2.0.0