實例方法
for
forEach(_:)
以與
for
- in
循環相同的順序調用序列中每個元素的給定閉包。聲明
func forEach(_ body: (Self.Element) throws -> Void) rethrows
參數
body
將序列的元素作為參數的閉包。
詳述
以下示例中的兩個循環產生相同的輸出:
let numberWords = ["one", "two", "three"]
for word in numberWords {
print(word)
}
// Prints "one"
// Prints "two"
// Prints "three"
numberWords.forEach { word in
print(word)
}
// Same as above
使用 forEach
方法與 for
- in
循環在兩個重要方麵不同:
-
您不能使用
break
或continue
語句退出body
閉包的當前調用或跳過後續調用。 -
在
body
閉包中使用return
語句隻會退出當前對body
的調用,而不是任何外部範圍,並且不會跳過後續調用。
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 CollectionDifference forEach(_:)。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。