實例方法
starts(with:)
返回一個布爾值,指示序列的初始元素是否與另一個序列中的元素相同。
聲明
func starts<PossiblePrefix>(with possiblePrefix: PossiblePrefix) -> Bool where PossiblePrefix : Sequence, Self.Element == PossiblePrefix.Element
當
Element
符合 Equatable
時可用。返回值
true
如果序列的初始元素與 possiblePrefix
的元素相同;否則,false
。如果 possiblePrefix
沒有元素,則返回值為 true
。
參數
possiblePrefix
要與此序列進行比較的序列。
詳述
此示例測試一個可數範圍是否以另一個可數範圍的元素開始。
let a = 1...3
let b = 1...10
print(b.starts(with: a))
// Prints "true"
將沒有元素或空集合的序列作為 possiblePrefix
傳遞總是會導致 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:本文由純淨天空篩選整理自apple.com大神的英文原創作品 String.UnicodeScalarView starts(with:)。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。