-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
21c531b
commit fbda322
Showing
2 changed files
with
102 additions
and
170 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,93 +1,72 @@ | ||
type Methods<T, E> = { | ||
expect: (message: string) => T; | ||
expectError: (message: string) => E; | ||
unwrap: () => T; | ||
unwrapOr: (_default: T) => T; | ||
unwrapOrElse: (fn: (error: E) => T) => T; | ||
map: <U>(fn: (value: T) => U) => Result<U, E>; | ||
mapError: <F>(fn: (error: E) => F) => Result<T, F>; | ||
mapOr: <U>(_default: U, fn: (value: T) => U) => U; | ||
mapOrElse: <U>(defaultFn: (error: E) => U, fn: (value: T) => U) => U; | ||
and: <U>(result: Result<U, E>) => Result<U, E>; | ||
andThen: <U>(fn: (value: T) => Result<U, E>) => Result<U, E>; | ||
or: <F>(result: Result<T, F>) => Result<T, F>; | ||
orElse: <F>(fn: (error: E) => Result<T, F>) => Result<T, F>; | ||
match: <U, F>(matcher: { | ||
ok: (value: T) => U; | ||
error: (error: E) => F; | ||
}) => U | F; | ||
export type Result<T, E> = ( | ||
| { ok: true; value: T } | ||
| { ok: false; error: E } | ||
) & { | ||
expect(message: string): T; | ||
expectError(message: string): E; | ||
unwrap(): T; | ||
unwrapOr(_default: T): T; | ||
unwrapOrElse(fn: (error: E) => T): T; | ||
map<U>(fn: (value: T) => U): Result<U, E>; | ||
mapError<F>(fn: (error: E) => F): Result<T, F>; | ||
mapOr<U>(_default: U, fn: (value: T) => U): U; | ||
mapOrElse<U>(defaultFn: (error: E) => U, fn: (value: T) => U): U; | ||
and<U>(result: Result<U, E>): Result<U, E>; | ||
andThen<U>(fn: (value: T) => Result<U, E>): Result<U, E>; | ||
or<F>(result: Result<T, F>): Result<T, F>; | ||
orElse<F>(fn: (error: E) => Result<T, F>): Result<T, F>; | ||
eq(other: Result<T, E>): boolean; | ||
}; | ||
|
||
type Attributes<T, E> = { ok: true; value: T } | { ok: false; error: E }; | ||
export function Ok<T extends void, E>(value?: T): Result<T, E>; | ||
export function Ok<T, E>(value: T): Result<T, E>; | ||
export function Ok(value: unknown) { | ||
return createResult({ ok: true, value }); | ||
} | ||
|
||
export function Err<T, E extends void>(error?: E): Result<T, E>; | ||
export function Err<T, E>(error: E): Result<T, E>; | ||
export function Err(error: unknown) { | ||
return createResult({ ok: false, error }); | ||
} | ||
|
||
export type Result<T, E> = Attributes<T, E> & Methods<T, E>; | ||
export const Result = { Ok, Err }; | ||
|
||
function createResult<T, E>(init: Attributes<T, E>): Result<T, E> { | ||
export default Result; | ||
|
||
function createResult<T, E>( | ||
init: { ok: true; value: T } | { ok: false; error: E } | ||
): Result<T, E> { | ||
return { | ||
...init, | ||
|
||
expect: (message) => { | ||
if (init.ok) return init.value; | ||
throw new Error(message); | ||
}, | ||
|
||
expectError: (message) => { | ||
if (init.ok) throw new Error(message); | ||
return init.error; | ||
}, | ||
|
||
unwrap: () => { | ||
if (init.ok) return init.value; | ||
throw new Error(); | ||
}, | ||
|
||
unwrapOr: (_default) => (init.ok ? init.value : _default), | ||
unwrapOrElse: (fn) => (init.ok ? init.value : fn(init.error)), | ||
and: (result) => (init.ok ? result : createResult(init)), | ||
andThen: (fn) => (init.ok ? fn(init.value) : createResult(init)), | ||
or: (result) => (init.ok ? createResult(init) : result), | ||
orElse: (fn) => (init.ok ? createResult(init) : fn(init.error)), | ||
|
||
map: (fn) => | ||
createResult(init.ok ? { ok: true, value: fn(init.value) } : init), | ||
|
||
mapError: (fn) => | ||
createResult(init.ok ? init : { ok: false, error: fn(init.error) }), | ||
|
||
mapOr: (_default, fn) => (init.ok ? fn(init.value) : _default), | ||
|
||
mapOrElse: (defaultFn, fn) => | ||
init.ok ? fn(init.value) : defaultFn(init.error), | ||
|
||
match: (matcher) => | ||
init.ok ? matcher.ok(init.value) : matcher.error(init.error), | ||
eq: (other) => | ||
init.ok | ||
? other.ok && init.value === other.value | ||
: !other.ok && init.error === other.error, | ||
}; | ||
} | ||
|
||
export const Result = { | ||
ok: <T, E>(value: T): Result<T, E> => createResult({ ok: true, value }), | ||
error: <T, E>(error: E): Result<T, E> => createResult({ ok: false, error }), | ||
|
||
equals: <T, E>(a: Result<T, E>, b: Result<T, E>): boolean => | ||
a.ok ? b.ok && a.value === b.value : !b.ok && a.error === b.error, | ||
|
||
from: <T, E>(fn: () => T): Result<T, E> => { | ||
try { | ||
return Result.ok(fn()); | ||
} catch (e: any) { | ||
return Result.error(e); | ||
} | ||
}, | ||
|
||
wrap: | ||
<T, E, A extends Array<any> = []>( | ||
fn: (...args: A) => T | ||
): ((...args: A) => Result<T, E>) => | ||
(...args) => { | ||
try { | ||
return Result.ok(fn(...args)); | ||
} catch (e: any) { | ||
return Result.error(e); | ||
} | ||
}, | ||
}; |
Oops, something went wrong.