Ruby中没有增量运算符(++)? [英] No increment operator (++) in Ruby?

问题描述

可能重复:
为什么Ruby不支持i ++或i—用于fixnum?

Possible Duplicate:
Why doesn't Ruby support i++ or i— for fixnum?

为什么Ruby中没有增量运算符?

Why is there no increment operator in Ruby?

例如

i++
++i

++运算符是否还用于其他用途?有真实原因吗?

Is the ++ operator used for something else? Is there a real reason for this?

推荐答案

Ruby没有前/后递增/递减运算符.例如，x++或x--将无法解析.更重要的是，++x或--x将什么都不做！实际上，它们表现为多个一元前缀运算符:-x == ---x == -----x == ......要增加数字，只需编写x += 1.

Ruby has no pre/post increment/decrement operator. For instance, x++ or x-- will fail to parse. More importantly, ++x or --x will do nothing! In fact, they behave as multiple unary prefix operators: -x == ---x == -----x == ...... To increment a number, simply write x += 1.

来自"Ruby新手应该知道的事情" "((存档，

Taken from "Things That Newcomers to Ruby Should Know " (archive, mirror)

这比以往任何时候都更好.

That explains it better than I ever could.

以及语言作者本人的原因(

and the reason from the language author himself (source):

1. ++和-在Ruby中不是保留的运算符.
C的递增/递减运算符实际上是隐藏的赋值.它们影响变量，而不影响对象.您无法通过方法完成分配. Ruby改用+ =/-=运算符.
2. 自身不能成为分配目标.此外，更改整数1的值可能会在整个程序中引起严重的混乱.

1. ++ and -- are NOT reserved operator in Ruby.
2. C's increment/decrement operators are in fact hidden assignment. They affect variables, not objects. You cannot accomplish assignment via method. Ruby uses +=/-= operator instead.
3. self cannot be a target of assignment. In addition, altering the value of integer 1 might cause severe confusion throughout the program.

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