实例方法
random
randomElement(using:)
返回集合的随机元素,使用给定的生成器作为随机源。
声明
func randomElement<T>(using generator: inout T) -> Self.Element? where T : RandomNumberGenerator
返回值
集合中的随机元素。如果集合为空,则该方法返回 nil
。
参数
generator
选择随机元素时使用的随机数生成器。
详述
当您使用自定义随机数生成器时,调用 randomElement(using:)
从数组或另一个集合中选择一个随机元素。此示例从数组中随机选择一个名称:
let names = ["Zoey", "Chloe", "Amani", "Amaia"]
let randomName = names.randomElement(using: &myGenerator)!
// randomName == "Amani"
可用版本
iOS 8.0+, iPadOS 8.0+, macOS 10.10+, Mac Catalyst 13.0+, tvOS 9.0+, watchOS 2.0+
相关用法
- Swift AnyBidirectionalCollection randomElement()用法及代码示例
- Swift AnyBidirectionalCollection reduce(into:_:)用法及代码示例
- Swift AnyBidirectionalCollection reduce(_:_:)用法及代码示例
- Swift AnyBidirectionalCollection reversed()用法及代码示例
- Swift AnyBidirectionalCollection elementsEqual(_:)用法及代码示例
- Swift AnyBidirectionalCollection lexicographicallyPrecedes(_:)用法及代码示例
- Swift AnyBidirectionalCollection split(separator:maxSplits:omittingEmptySubsequences:)用法及代码示例
- Swift AnyBidirectionalCollection sorted()用法及代码示例
- Swift AnyBidirectionalCollection shuffled(using:)用法及代码示例
- Swift AnyBidirectionalCollection starts(with:)用法及代码示例
- Swift AnyBidirectionalCollection contains(where:)用法及代码示例
- Swift AnyBidirectionalCollection suffix(from:)用法及代码示例
- Swift AnyBidirectionalCollection first用法及代码示例
- Swift AnyBidirectionalCollection prefix(through:)用法及代码示例
- Swift AnyBidirectionalCollection min()用法及代码示例
- Swift AnyBidirectionalCollection compactMap(_:)用法及代码示例
- Swift AnyBidirectionalCollection joined()用法及代码示例
- Swift AnyBidirectionalCollection indices用法及代码示例
- Swift AnyBidirectionalCollection subscript(_:)用法及代码示例
- Swift AnyBidirectionalCollection sorted(by:)用法及代码示例
- Swift AnyBidirectionalCollection split(maxSplits:omittingEmptySubsequences:whereSeparator:)用法及代码示例
- Swift AnyBidirectionalCollection lastIndex(of:)用法及代码示例
- Swift AnyBidirectionalCollection firstIndex(of:)用法及代码示例
- Swift AnyBidirectionalCollection last(where:)用法及代码示例
- Swift AnyBidirectionalCollection max(by:)用法及代码示例
注:本文由纯净天空筛选整理自apple.com大神的英文原创作品 AnyBidirectionalCollection randomElement(using:)。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。