如何迭代函数产生的所有值？

发布于 2024-12-07 06:17:16 字数 520 浏览 1 评论 0原文

我是新手，我发现自己编写了一些 for 循环，如下所示：

for element, err := producer.Produce(); err == nil; element, err = producer.Produce() {
    process(element)
}

其中 Producer.Produce() 是一个类似于 reader 的函数。 ReadString('\n') 或 fmt.Fscan(Reader, &token)。我很想写，

for element := range elements {
    process(element)
}

但现在，我很高兴知道是否有一种更干净的方法来迭代 go 中此类函数的输出。特别是，是否有一种好方法可以消除 init 语句和 for 语句的 post 语句中这种烦人的重复？

原文

I am new to go, and I have found myself writing a few for loops which look like this:

for element, err := producer.Produce(); err == nil; element, err = producer.Produce() {
    process(element)
}

where producer.Produce() is a function like reader.ReadString('\n') or fmt.Fscan(Reader, &token). I would much rather like to write

for element := range elements {
    process(element)
}

but for now, I would be satisfied to know if there is a cleaner way to iterate over the output of these kinds of functions in go. In particular, is there a nice way to get rid of this annoying duplication in the init statement and the post statement of the for statement?

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汹涌人海 2024-12-14 06:17:16

我认为没有什么比你正在寻找的更干净的东西了。惯用的写法是：

for {
    element, err := producer.Produce()
    if err != nil {
        break
    }
    process(element)
}

I don't think there's anything quite as clean as what you're looking for. The idiomatic way to write it is:

for {
    element, err := producer.Produce()
    if err != nil {
        break
    }
    process(element)
}

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小女人ら 2024-12-14 06:17:16

以下是通过此类方法创建通道的方法：

elements := make(chan elementType)

val send func()
send = func() {
    if element, err := producer.Produce(); err == nil {
        elements <- element
        go send()
    } else {
      close(elements)
    }
}
go send()

for element := range elements {
    process(element)
}

Here's a way to create a channel from such a method:

elements := make(chan elementType)

val send func()
send = func() {
    if element, err := producer.Produce(); err == nil {
        elements <- element
        go send()
    } else {
      close(elements)
    }
}
go send()

for element := range elements {
    process(element)
}

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