关键字或语句与函数调用之间有什么区别？ [英] What's the difference between a keyword or a statement, and a function call?

问题描述

我最近才考虑这个问题，因为Python 3正在将 print 从语句更改为函数。

I was thinking about this recently since Python 3 is changing print from a statement to a function.

然而，Ruby和CoffeeScript采用相反的方法，因为你经常省略函数的括号，从而模糊了关键字/语句和函数之间的区别。 （没有括号的函数调用看起来很像关键字。）

However, Ruby and CoffeeScript take the opposite approach, since you often leave out parentheses from functions, thereby blurring the distinction between keywords/statements and functions. (A function call without parentheses looks a lot like a keyword.)

一般来说，关键字和函数有什么区别？在我看来，一些关键字只是真正的功能。例如， return 3 也可以被认为是 return（3）其中返回函数在语言。或者在JavaScript中， typeof 是一个关键字，但它看起来非常像一个函数，可以用括号调用。

Generally, what's the difference between a keyword and a function? It seems to me that some keywords are really just functions. For example, return 3 could equally be thought of as return(3) where the return function is implemented natively in the language. Or in JavaScript, typeof is a keyword, but it seems very much like a function, and can be called with parentheses.

想法？

推荐答案

关键字是比功能低级的构建块，可以做功能不能做的事情。

Keywords are lower-level building blocks than functions, and can do things that functions can't.

您在问题中提到 return ，这是一个很好的例子：在您提及的所有语言中，方法使用函数提供与 return x 相同的行为。

You cite return in your question, which is a good example: In all the languages you mention, there's no way to use a function to provide the same behavior as return x.

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