實例方法
random
randomElement()
返回集合的隨機元素。
聲明
func randomElement() -> Self.Element?
返回值
集合中的隨機元素。如果集合為空,則該方法返回 nil
。
詳述
調用 randomElement()
從數組或另一個集合中選擇一個隨機元素。此示例從數組中隨機選擇一個名稱:
let names = ["Zoey", "Chloe", "Amani", "Amaia"]
let randomName = names.randomElement()!
// randomName == "Amani"
該方法相當於調用randomElement(using:)
,傳入係統默認的隨機生成器。
可用版本
iOS 8.0+, iPadOS 8.0+, macOS 10.10+, Mac Catalyst 13.0+, tvOS 9.0+, watchOS 2.0+
相關用法
- Swift Substring.UTF16View randomElement(using:)用法及代碼示例
- Swift Substring.UTF16View reduce(into:_:)用法及代碼示例
- Swift Substring.UTF16View reversed()用法及代碼示例
- Swift Substring.UTF16View reduce(_:_:)用法及代碼示例
- Swift Substring.UTF16View enumerated()用法及代碼示例
- Swift Substring.UTF16View sorted(by:)用法及代碼示例
- Swift Substring.UTF16View elementsEqual(_:)用法及代碼示例
- Swift Substring.UTF16View indices用法及代碼示例
- Swift Substring.UTF16View max(by:)用法及代碼示例
- Swift Substring.UTF16View contains(_:)用法及代碼示例
- Swift Substring.UTF16View lexicographicallyPrecedes(_:)用法及代碼示例
- Swift Substring.UTF16View split(maxSplits:omittingEmptySubsequences:whereSeparator:)用法及代碼示例
- Swift Substring.UTF16View split(separator:maxSplits:omittingEmptySubsequences:)用法及代碼示例
- Swift Substring.UTF16View index(_:offsetBy:)用法及代碼示例
- Swift Substring.UTF16View filter(_:)用法及代碼示例
- Swift Substring.UTF16View last用法及代碼示例
- Swift Substring.UTF16View starts(with:)用法及代碼示例
- Swift Substring.UTF16View flatMap(_:)用法及代碼示例
- Swift Substring.UTF16View lastIndex(where:)用法及代碼示例
- Swift Substring.UTF16View last(where:)用法及代碼示例
- Swift Substring.UTF16View shuffled(using:)用法及代碼示例
- Swift Substring.UTF16View dropLast(_:)用法及代碼示例
- Swift Substring.UTF16View dropFirst(_:)用法及代碼示例
- Swift Substring.UTF16View shuffled()用法及代碼示例
- Swift Substring.UTF16View first(where:)用法及代碼示例
注:本文由純淨天空篩選整理自apple.com大神的英文原創作品 Substring.UTF16View randomElement()。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。