实例方法
starts(with:)
返回一个布尔值,指示序列的初始元素是否与另一个序列中的元素相同。
声明
func starts<PossiblePrefix>(with possiblePrefix: PossiblePrefix) -> Bool where PossiblePrefix : Sequence, Self.Element == PossiblePrefix.Element
当
Element
符合 Equatable
时可用。返回值
true
如果序列的初始元素与 possiblePrefix
的元素相同;否则,false
。如果 possiblePrefix
没有元素,则返回值为 true
。
参数
possiblePrefix
要与此序列进行比较的序列。
详述
此示例测试一个可数范围是否以另一个可数范围的元素开始。
let a = 1...3
let b = 1...10
print(b.starts(with: a))
// Prints "true"
将没有元素或空集合的序列作为 possiblePrefix
传递总是会导致 true
。
print(b.starts(with: []))
// Prints "true"
可用版本
iOS 8.0+, iPadOS 8.0+, macOS 10.10+, Mac Catalyst 13.0+, tvOS 9.0+, watchOS 2.0+
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注:本文由纯净天空筛选整理自apple.com大神的英文原创作品 AnyBidirectionalCollection starts(with:)。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。