39 lines
1.4 KiB
JavaScript
39 lines
1.4 KiB
JavaScript
import { reduce } from './reduce';
|
|
/**
|
|
* The Min 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 smallest value.
|
|
*
|
|
* <img src="./img/min.png" width="100%">
|
|
*
|
|
* @example <caption>Get the minimal value of a series of numbers</caption>
|
|
* Rx.Observable.of(5, 4, 7, 2, 8)
|
|
* .min()
|
|
* .subscribe(x => console.log(x)); // -> 2
|
|
*
|
|
* @example <caption>Use a comparer function to get the minimal item</caption>
|
|
* interface Person {
|
|
* age: number,
|
|
* name: string
|
|
* }
|
|
* Observable.of<Person>({age: 7, name: 'Foo'},
|
|
* {age: 5, name: 'Bar'},
|
|
* {age: 9, name: 'Beer'})
|
|
* .min<Person>( (a: Person, b: Person) => a.age < b.age ? -1 : 1)
|
|
* .subscribe((x: Person) => console.log(x.name)); // -> 'Bar'
|
|
* }
|
|
*
|
|
* @see {@link max}
|
|
*
|
|
* @param {Function} [comparer] - Optional comparer function that it will use instead of its default to compare the
|
|
* value of two items.
|
|
* @return {Observable<R>} An Observable that emits item with the smallest value.
|
|
* @method min
|
|
* @owner Observable
|
|
*/
|
|
export function min(comparer) {
|
|
const min = (typeof comparer === 'function')
|
|
? (x, y) => comparer(x, y) < 0 ? x : y
|
|
: (x, y) => x < y ? x : y;
|
|
return reduce(min);
|
|
}
|
|
//# sourceMappingURL=min.js.map
|