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问题描述
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
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(源):
and the reason from the language author himself (source):
- ++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.
- 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.
- ++ and -- are NOT reserved operator in Ruby.
- 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.
- 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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