import {Observable} from '../Observable';
import {ReduceOperator} from './reduce';
/**
* The Max operator operates on an Observable that emits numbers (or items that can be evaluated as numbers),
* and when source Observable completes it emits a single item: the item with the largest number.
*
* <img src="./img/max.png" width="100%">
*
* @param {Function} optional comparer function that it will use instead of its default to compare the value of two
* items.
* @returns {Observable} an Observable that emits item with the largest number.
*/
export function max<T>(comparer?: (value1: T, value2: T) => T): Observable<T> {
const max: typeof comparer = (typeof comparer === 'function')
? comparer
: (x, y) => x > y ? x : y;
return this.lift(new ReduceOperator(max));
}
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