实例方法
suffix(from:)
返回从指定位置到集合末尾的子序列。
声明
func suffix(from start: Self.Index) -> Self.SubSequence
返回值
从 start
位置开始的子序列。
参数
start
开始生成子序列的索引。
start
必须是集合的有效索引。
详述
以下示例在整数数组中搜索数字 40
的索引,然后打印从该索引开始的数组后缀:
let numbers = [10, 20, 30, 40, 50, 60]
if let i = numbers.firstIndex(of: 40) {
print(numbers.suffix(from: i))
}
// Prints "[40, 50, 60]"
将集合的 endIndex
作为 start
参数传递会导致空子序列。
print(numbers.suffix(from: numbers.endIndex))
// Prints "[]"
使用 suffix(from:)
方法等效于使用索引中的部分范围作为集合的下标。下标符号优于 suffix(from:)
。
if let i = numbers.firstIndex(of: 40) {
print(numbers[i...])
}
// Prints "[40, 50, 60]"
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:本文由纯净天空筛选整理自apple.com大神的英文原创作品 AnyBidirectionalCollection suffix(from:)。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。