41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
"use strict";
|
|
var reduce_1 = require('./reduce');
|
|
/**
|
|
* 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
|
|
*/
|
|
function max(comparer) {
|
|
var max = (typeof comparer === 'function')
|
|
? function (x, y) { return comparer(x, y) > 0 ? x : y; }
|
|
: function (x, y) { return x > y ? x : y; };
|
|
return reduce_1.reduce(max);
|
|
}
|
|
exports.max = max;
|
|
//# sourceMappingURL=max.js.map
|