cleanup, patterns

js-fp3/library/patterns.d.ts

@@ -0,0 +1,9 @@
+export type Predicate<T> = (value: T) => boolean;
+export type Handler<T, R> = (value: T) => R;
+export type Branch<T, R> = [Predicate<T>, Handler<T, R>];
+
+export declare const match: <T, R>(...branches: Branch<T, R>[]) => (value: T) => R;
+
+export declare const when: <T, R>(predicate: Predicate<T>, handler: Handler<T, R>) => Branch<T, R>;
+
+export declare const any: Predicate<any>;