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fold()

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

Alias for match.

Pattern matches on an Either.

Type Parameters​

E: E​

The error type.

A: A​

The success type.

B: B​

The return type.

Parameters​

onLeft: (e) => B​

Handler for Left case.

onRight: (a) => B​

Handler for Right case.

Returns​

A function that takes an Either and returns B.

Since​

2.0.0