Package Exports
- lemons
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (lemons) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
🍋 Common algebraïc data types for JavaScript, 'cause when life hands you lemons...
Maybe
Pseudo-type:
type Maybe<T>
= Just T
| NothingUsage example:
import Maybe, { Just, Nothing } from 'lemons/Maybe';
// or: import { Maybe, Just, Nothing } from 'lemons';
const r1: Maybe<number> = Just(42);
r1.isJust() // => true
r1.isNothing() // => false
r1.withDefault(99) // => 42
r1.unwrap() // => 42
r1.expect('Foo') // => 42
const r2: Maybe<number> = Nothing();
r2.isJust() // => false
r2.isNothing() // => true
r2.withDefault(99) // => 99
r2.unwrap() // throws Error('Cannot unwrap a Nothing')
r2.expect('Foo') // throws Error('Foo')Result
Pseudo-type:
type Result<E, T>
= Ok T
| Err EUsage example:
import Result, { Ok, Err } from 'lemons/Result';
// or: import { Result, Ok, Err } from 'lemons';
const r1: Result<string, number> = Ok(42);
r1.isOk() // => true
r1.isErr() // => false
r1.withDefault(99) // => 42
r1.unwrap() // => 42
const r2: Result<string, number> = Err('Oops');
r2.isOk() // => false
r2.isErr() // => true
r2.withDefault(99) // => 99
r2.unwrap() // throws 'Oops'LazyResult
Pseudo-type:
type LazyResult<E, T>
= Initial
| Loading
| Failure E
| Success TUseful for state management that typically has an initial, loading, and a failure/success outcome state, like page loading, or submitting a form. The following example shows how you would use the LazyResult as part of a React app, but since ADTs are simple data structures, they work with any technology.
Annotated usage example:
