为什么不在if/else的末尾添加分号(;)? [英] Why don't we add a semicolon (;) at the end of if/else?

问题描述

在Rust中，我注意到除2种语句外，所有内容都是一个表达式.每个添加;的表达式都将成为一条语句. Rust的语法希望语句跟随其他语句.

In Rust, I have noticed that everything is an expression except 2 kinds of statements. Every expression that adds ; will become a statement. Rust's grammar wants statements to follow other statements.

那么为什么不在if/else表达式"的末尾添加;?这也是一个表达式，所以我们为什么不这样做:

So why don't we add ; at the end of an if / else "expression"? This is also an expression, so why don't we do this:

if true {
    println!("true");
} else {
    println!("false");
};

推荐答案

我想是因为它是Java或Nginx-Conf等其他语言中的块表达式，所以只能在语句之后而不是在块之后设置分号.

I guess because it is a block expression in other languages like Java or Nginx-Conf a semicolon is only set after statements and not after blocks.

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