實例方法
form
formUnion(_:)
將給定集合的元素添加到集合中。
必需的。提供默認實現。
聲明
mutating func formUnion(_ other: Self)
參數
other
與當前集合類型相同的集合。
詳述
在以下示例中,visitors
集合的元素被添加到 attendees
集合中:
var attendees: Set = ["Alicia", "Bethany", "Diana"]
let visitors: Set = ["Diana", "Marcia", "Nathaniel"]
attendees.formUnion(visitors)
print(attendees)
// Prints "["Diana", "Nathaniel", "Bethany", "Alicia", "Marcia"]"
如果該集合已包含一個或多個也在 other
中的元素,則保留現有成員。
var initialIndices = Set(0..<5)
initialIndices.formUnion([2, 3, 6, 7])
print(initialIndices)
// Prints "[2, 4, 6, 7, 0, 1, 3]"
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 SetAlgebra formUnion(_:)。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。