work.suroh.tk/node_modules/rxjs/operator/max.d.ts

34 lines
1.3 KiB
TypeScript
Raw Normal View History

2019-12-02 12:22:45 +00:00
import { Observable } from '../Observable';
/**
* The Max operator operates on an Observable that emits numbers (or items that can be compared with a provided function),
* and when source Observable completes it emits a single item: the item with the largest value.
*
* <img src="./img/max.png" width="100%">
*
* @example <caption>Get the maximal value of a series of numbers</caption>
* Rx.Observable.of(5, 4, 7, 2, 8)
* .max()
* .subscribe(x => console.log(x)); // -> 8
*
* @example <caption>Use a comparer function to get the maximal item</caption>
* interface Person {
* age: number,
* name: string
* }
* Observable.of<Person>({age: 7, name: 'Foo'},
* {age: 5, name: 'Bar'},
* {age: 9, name: 'Beer'})
* .max<Person>((a: Person, b: Person) => a.age < b.age ? -1 : 1)
* .subscribe((x: Person) => console.log(x.name)); // -> 'Beer'
* }
*
* @see {@link min}
*
* @param {Function} [comparer] - Optional comparer function that it will use instead of its default to compare the
* value of two items.
* @return {Observable} An Observable that emits item with the largest value.
* @method max
* @owner Observable
*/
export declare function max<T>(this: Observable<T>, comparer?: (x: T, y: T) => number): Observable<T>;