Return Value 戻り値
A sequence starting after the initial, consecutive elements that satisfy predicate.
Instance Method
インスタンスメソッド
drop(while:)
Returns a sequence by skipping the initial, consecutive elements that satisfy the given predicate.
Availability 有効性
- iOS 13.0+
- iPadOS 13.0+
- macOS 10.15+
- Mac Catalyst 13.0+
- tvOS 13.0+
- watchOS 6.0+
Technology
- Swift
UI
Declaration 宣言
func drop(while predicate: (Self.Element) throws -> Bool) rethrows -> DropWhileSequence <Self>Parameters パラメータ
predicateA closure that takes an element of the sequence as its argument and returns a Boolean value indicating whether the element should be included in the result.
Discussion 議論
The following example uses the drop(while:) method to skip over the positive numbers at the beginning of the numbers array. The result begins with the first element of numbers that does not satisfy predicate.
let numbers = [3, 7, 4, -2, 9, -6, 10, 1]
let startingWithNegative = numbers.drop(while: { $0 > 0 })
// startingWithNegative == [-2, 9, -6, 10, 1]If predicate matches every element in the sequence, the result is an empty sequence.