import { distinctUntilChanged as higherOrder } from '../operators/distinctUntilChanged'; /* tslint:enable:max-line-length */ /** * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item. * * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted. * * If a comparator function is not provided, an equality check is used by default. * * @example A simple example with numbers * Observable.of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4) * .distinctUntilChanged() * .subscribe(x => console.log(x)); // 1, 2, 1, 2, 3, 4 * * @example An example using a compare function * interface Person { * age: number, * name: string * } * * Observable.of( * { age: 4, name: 'Foo'}, * { age: 7, name: 'Bar'}, * { age: 5, name: 'Foo'}) * { age: 6, name: 'Foo'}) * .distinctUntilChanged((p: Person, q: Person) => p.name === q.name) * .subscribe(x => console.log(x)); * * // displays: * // { age: 4, name: 'Foo' } * // { age: 7, name: 'Bar' } * // { age: 5, name: 'Foo' } * * @see {@link distinct} * @see {@link distinctUntilKeyChanged} * * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source. * @return {Observable} An Observable that emits items from the source Observable with distinct values. * @method distinctUntilChanged * @owner Observable */ export function distinctUntilChanged(compare, keySelector) { return higherOrder(compare, keySelector)(this); } //# sourceMappingURL=distinctUntilChanged.js.map