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Add slice2 and asResult functions

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This commit is contained in:
simojenki
2021-03-02 10:16:56 +11:00
parent 3aa1056aa5
commit bdee01d2c7
6 changed files with 86 additions and 74 deletions
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27
tests/in_memory_music_service.ts
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@@ -10,6 +10,8 @@ import {
Artist,
MusicLibrary,
Paging,
slice2,
asResult,
} from "../src/music_service";
const artistWithAlbumsToArtist = (it: ArtistWithAlbums): Artist => ({
@@ -55,12 +57,10 @@ export class InMemoryMusicService implements MusicService {
if (this.users[credentials.username] != credentials.password)
return Promise.reject("Invalid auth token");
return Promise.resolve({
artists: ({ _index, _count }: Paging) => {
const i0 = _index || 0;
const i1 = _count ? i0 + _count : undefined;
const artists = this.artists.map(artistWithAlbumsToArtist);
return Promise.resolve([artists.slice(i0, i1), artists.length]);
},
artists: (paging: Paging) =>
Promise.resolve(this.artists.map(artistWithAlbumsToArtist))
.then(slice2(paging))
.then(asResult),
artist: (id: string) =>
pipe(
this.artists.find((it) => it.id === id),
@@ -76,20 +76,19 @@ export class InMemoryMusicService implements MusicService {
artistId?: string;
_index?: number;
_count?: number;
}) => {
const i0 = _index || 0;
const i1 = _count ? i0 + _count : undefined;
const albums = this.artists
.filter(
}) =>
Promise.resolve(
this.artists.filter(
pipe(
O.fromNullable(artistId),
O.map(artistWithId),
O.getOrElse(() => all)
)
)
.flatMap((it) => it.albums);
return Promise.resolve([albums.slice(i0, i1), albums.length]);
},
)
.then((artists) => artists.flatMap((it) => it.albums))
.then(slice2({ _index, _count }))
.then(asResult),
});
}