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@nlozgachev/pipekit

fold

fold<A, B>(onNone, onSome): (data) => B

Defined in: Core/Option.ts:164

Extracts the value from a Option by providing handlers for both cases.

Type Parameters

Section titled “Type Parameters”

A

Section titled “A”

A

B

Section titled “B”

B

Parameters

Section titled “Parameters”

onNone

Section titled “onNone”

() => B

onSome

Section titled “onSome”

(a) => B

Returns

Section titled “Returns”

(data): B

Parameters

Section titled “Parameters”

data

Section titled “data”

Option<A>

Returns

Section titled “Returns”

B

Example

Section titled “Example”
pipe(
  Option.of(5),
  Option.fold(
    () => "No value",
    n => `Value: ${n}`
  )
); // "Value: 5"