实例方法
for
forEach(_:)
以与
for
- in
循环相同的顺序调用序列中每个元素的给定闭包。声明
func forEach(_ body: (Self.Element) throws -> Void) rethrows
参数
body
将序列的元素作为参数的闭包。
详述
以下示例中的两个循环产生相同的输出:
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
方法与 for
- in
循环在两个重要方面不同:
-
您不能使用
break
或continue
语句退出body
闭包的当前调用或跳过后续调用。 -
在
body
闭包中使用return
语句只会退出当前对body
的调用,而不是任何外部范围,并且不会跳过后续调用。
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:本文由纯净天空筛选整理自apple.com大神的英文原创作品 LazyDropWhileSequence forEach(_:)。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。