Interface Optional<T>

Type Parameters

T

Hierarchy

Iterable<T>
Monad<T>
- Optional

Index

Properties

Methods

[iterator] apply applyTo catchMap flatMap fold forEach map value

Properties

`Readonly` isJust

isJust: boolean

`Readonly` isNone

isNone: boolean

Methods

[iterator]

[iterator](): Iterator<T, any, undefined>
Returns Iterator<T, any, undefined>
Inherited from Iterable.__@iterator@1150
- Defined in node_modules/typescript/lib/lib.es2015.iterable.d.ts:51

apply

apply<R>(func: Optional<Func<[T], R>>): Optional<R>
Type Parameters
- R
Parameters
- func: Optional<Func<[T], R>>
Returns Optional<R>
Overrides Monad.apply
- Defined in packages/monad/src/lib/Optional.ts:20

applyTo

applyTo<R>(value: Optional<R>): T extends Func<[R], unknown> ? Optional<ReturnType<T>> : never
Type Parameters
- R
Parameters
- value: Optional<R>
Returns T extends Func<[R], unknown> ? Optional<ReturnType<T>> : never
Overrides Monad.applyTo
- Defined in packages/monad/src/lib/Optional.ts:21

catchMap

catchMap(fallback: Func<[], Optional<T>>): Optional<T>
Parameters
- fallback: Func<[], Optional<T>>
Returns Optional<T>
- Defined in packages/monad/src/lib/Optional.ts:16

flatMap

flatMap<R>(project: Func<[value: T], Optional<R>>): Optional<R>
Type Parameters
- R
Parameters
- project: Func<[value: T], Optional<R>>
Returns Optional<R>
Overrides Monad.flatMap
- Defined in packages/monad/src/lib/Optional.ts:15

fold

fold<R>(onPresent: Func<[value: T], R>, onAbsent: Func<[], R>): R
Type Parameters
- R
Parameters
- onPresent: Func<[value: T], R>
- onAbsent: Func<[], R>
Returns R
- Defined in packages/monad/src/lib/Optional.ts:25

forEach

forEach(callback: Func<[value: T], unknown>): Optional<T>
Parameters
- callback: Func<[value: T], unknown>
Returns Optional<T>
- Defined in packages/monad/src/lib/Optional.ts:18

map

map<R>(project: Func<[value: T], R>): Optional<R>
Type Parameters
- R
Parameters
- project: Func<[value: T], R>
Returns Optional<R>
Overrides Monad.map
- Defined in packages/monad/src/lib/Optional.ts:13

value

value(): undefined | T
Returns undefined | T
- Defined in packages/monad/src/lib/Optional.ts:10
value(fallback: Func<[], T>): T
Parameters
- fallback: Func<[], T>
Returns T
- Defined in packages/monad/src/lib/Optional.ts:11

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