The syntax used in Listing 2 should be fairly easy for most developers to understand: using parenthesis to delimit groupings, | characters to indicate choices between alternatives, and?

清单2中使用的语法对于大多数开发人员而言是非常容易理解的：使用圆括号来划分组，使用|字符表示备选项，以及使用？

youdao

A blank space should not be used between a function value and its left parenthesis.

函数参数与左括号之间不应该有空格。

youdao

There should be no space between the name of a function and the left parenthesis of its parameter list.

函数名与((左括号)之间不应该有空格。)

youdao

So the question is: Do you have to have this space between the if and the parenthesis?

所以那个问题是：我们在if和括号之间,需不需要空格呢？

哈佛公开课 - 计算机科学课程节选

> You said you'd make a space between if and the parenthesis; does that actually matter?

>，你说你在if和括号之间用了个空格;,那有什么影响吗？

哈佛公开课 - 计算机科学课程节选