斯卡拉“<-"为了理解

我发现 Scala 总是对任何事情都有自然的解释".总是类似于哦，但这只是在这个和那个对象上调用一个带有这个和那个参数的函数".从某种意义上说，没有什么是真正的编译器魔法，正如我们在其他语言中所知道的那样.

I have found that Scala always has a "natural explanation" to anything. Always something like "ohh, but that's just a function being called on this and that object with this and that parameter". In a sense, nothing is really compiler-magic as we know it from other languages.

我的问题是关于以下代码中使用的 <- 运算符:

My question is on the <- operator as used in the following code:

for(i <- 0 to 10) println(i)

在这个例子中，我可以看到它被重写为:

In this example I can see it being rewritten to something like:

0.to(10).foreach((i:Int)=>println(i))

但这并没有解释 i 如何进入 foreach 函数内的匿名函数.在您编写 i 时，它不是对象，也不是已声明的变量.那么它是什么，它是如何被带到foreach内部的?

but this doesn't explain how the i got carried into the anonymous function inside the foreach function. At the point where you write i it is not an object, and not yet a declared variable. So what is it, and how is it being carried over to the inside of foreach?

我的猜测是我终于发现了一些实际上编译器魔法

My guess is that I finally discovered something which is in fact compiler magic

感谢您的时间.

澄清一下，我的问题是: <- 运算符如何在第一行代码中工作，因为 i 不是可以作为函数调用的对象.

To clarify, my question is: how does the <- operator work in the 1st line of code since i is not an object on which it can be called as a function.