實例方法
suffix(from:)
返回從指定位置到集合末尾的子序列。
聲明
func suffix(from start: Self.Index) -> Self.SubSequence
返回值
從 start
位置開始的子序列。
參數
start
開始生成子序列的索引。
start
必須是集合的有效索引。
詳述
以下示例在整數數組中搜索數字 40
的索引,然後打印從該索引開始的數組後綴:
let numbers = [10, 20, 30, 40, 50, 60]
if let i = numbers.firstIndex(of: 40) {
print(numbers.suffix(from: i))
}
// Prints "[40, 50, 60]"
將集合的 endIndex
作為 start
參數傳遞會導致空子序列。
print(numbers.suffix(from: numbers.endIndex))
// Prints "[]"
使用 suffix(from:)
方法等效於使用索引中的部分範圍作為集合的下標。下標符號優於 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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