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31 lines
1.2 KiB
31 lines
1.2 KiB
//
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// count.swift
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// RxSwiftExt
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//
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// Created by Fred on 06/11/2018.
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// Copyright © 2018 RxSwift Community. All rights reserved.
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//
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import Foundation
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import RxSwift
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extension Observable {
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/**
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Count the number of items emitted by an Observable
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- seealso: [count operator on reactivex.io](http://reactivex.io/documentation/operators/count.html)
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- returns: An Observable sequence containing a value that represents how many elements in the specified observable sequence satisfy a condition if provided, else the count of items.
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*/
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public func count() -> Observable<Int> {
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return reduce(0) { count, _ in count + 1 }
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}
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/**
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Count the number of items emitted by an Observable
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- seealso: [count operator on reactivex.io](http://reactivex.io/documentation/operators/count.html)
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- parameter predicate: predicate determines what elements to be counted.
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- returns: An Observable sequence containing a value that represents how many elements in the specified observable sequence satisfy a condition if provided, else the count of items.
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*/
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public func count(_ predicate: @escaping (Element) throws -> Bool) -> Observable<Int> {
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return filter(predicate).count()
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}
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}
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