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fromPredicate()

fromPredicate<A, E>(predicate, onFalse): (a) => Either<E, A>

Creates an Either from a predicate.

Type Parameters​

A: A​

The value type.

E: E​

The error type.

Parameters​

predicate: (a) => boolean​

The predicate function.

onFalse: (a) => E​

Function to create error when predicate fails.

Returns​

A function that creates an Either from a value.

Since​

2.0.0