實例方法
contains(_:)
返回一個布爾值,指示異步序列是否包含給定元素。
聲明
func contains(_ search: Self.Element) async rethrows -> Bool
當
Element
符合 Equatable
時可用。返回值
true
如果方法找到異步序列中的元素;否則,false
。
參數
search
要在異步序列中查找的元素。
詳述
在此示例中,名為 Counter
的異步序列生成從 1
到 10
的 Int
值。 contains(_:)
方法檢查序列是否產生值 5
:
let containsFive = await Counter(howHigh: 10)
.contains(5)
print(containsFive)
// Prints: true
可用版本
iOS 13.0+, iPadOS 13.0+, macOS 10.15+, Mac Catalyst 13.0+, tvOS 13.0+, watchOS 6.0+
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注:本文由純淨天空篩選整理自apple.com大神的英文原創作品 AsyncPrefixSequence contains(_:)。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。