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add filterEach operator

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This commit is contained in:
Dan Percic 2021-10-22 00:07:42 +03:00
parent df3a8957c8
commit 9461df16f7
1 changed files with 7 additions and 3 deletions
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10
src/lib/utils/operators.ts
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@ -1,17 +1,21 @@
import { distinctUntilChanged, map } from 'rxjs/operators';
import { OperatorFunction, pipe } from 'rxjs';
export function get<T>(predicate: (value: T, index: number) => boolean): OperatorFunction<T[], T | undefined> {
export function get<T>(predicate: (value: T, index: number) => boolean): OperatorFunction<readonly T[], T | undefined> {
return map(entities => entities.find(predicate));
}
export function any<T>(predicate: (value: T, index: number) => boolean): OperatorFunction<T[], boolean> {
export function any<T>(predicate: (value: T, index: number) => boolean): OperatorFunction<readonly T[], boolean> {
return map(entities => entities.some(predicate));
}
export function mapEach<T, R>(predicate: (value: T, index: number) => R): OperatorFunction<T[], R[]> {
export function mapEach<T, R>(predicate: (value: T, index: number) => R): OperatorFunction<readonly T[], R[]> {
return map(entities => entities.map(predicate));
}
export function filterEach<T>(predicate: (value: T, index: number) => boolean): OperatorFunction<readonly T[], T[]> {
return map(entities => entities.filter(predicate));
}
export const toLengthValue = (entities: unknown[]): number => entities?.length ?? 0;
export const getLength = pipe(map(toLengthValue), distinctUntilChanged());