feat(operators): adds match

src/operators/compounds/index.ts

@@ -0,0 +1 @@
+export * from './match';

src/operators/compounds/match.ts

@@ -0,0 +1,30 @@
+import { Observable, OperatorFunction } from 'rxjs';
+import { map, debounceTime } from 'rxjs/operators';
+import { changes, pick } from '../basics';
+import { getCompare } from '../../helpers/get-compare';
+import { CompareOptions } from '../../types';
+
+export interface MatchOptions extends CompareOptions {
+  pick?: boolean | null;
+  debounce?: number | null;
+}
+
+export function match<T, U>(
+  value: T,
+  options?: MatchOptions
+): OperatorFunction<U, boolean> {
+  const equal = getCompare(options);
+
+  return (observable: Observable<U>): Observable<boolean> => {
+    return observable.pipe(
+      map((item) => equal(value, item)),
+      changes(),
+      options && typeof options.debounce === 'number'
+        ? debounceTime(Math.max(0, options.debounce))
+        : (x) => x,
+      options && typeof options.pick === 'boolean'
+        ? pick(options.pick)
+        : (x) => x
+    );
+  };
+}

src/operators/index.ts

@@ -1 +1,2 @@
 export * from './basics';
+export * from './compounds';