實例方法
drop
dropLast(_:)
返回一個包含除給定數量的最終元素之外的所有元素的序列。
聲明
func dropLast(_ k: Int = 1) -> [Self.Element]
返回值
留下指定數量的元素的序列。
參數
n
要從序列末尾刪除的元素數。
n
必須大於或等於零。
詳述
序列必須是有限的。如果要刪除的元素數超過序列中的元素數,則結果為空序列。
let numbers = [1, 2, 3, 4, 5]
print(numbers.dropLast(2))
// Prints "[1, 2, 3]"
print(numbers.dropLast(10))
// Prints "[]"
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 DropWhileSequence dropLast(_:)。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。