From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2011-10-05T05:30:09+09:00
Subject: Re: Local vs method vs instance (was: Operator Overloading)

2011/10/4 Bartosz Dziewoński <matma.rex@gmail.com>:
> 2011/10/4 Jesús Gabriel y Galán <jgabrielygalan@gmail.com>:
>> Only an assignment creates a local variable in the scope.
>>
>
> This is actually only 1/7th true. There are as many as 7 ways to
> introduce a new variable, out of which anybody would guess about 5 if
> they though about it for a while ;), and 2 are quite obscure.
>
> These are:
>
> 1. Single- or multiple-assignment (including sub-assignment) anywhere
> an expression is allowed
> 2. A for loop's iterator variable(s)

Kind of assignment :-)

> 3. Formal arguments to a method

Good one, I was thinking only in the body of the method, but you can
also argue that someone does an assignment to them :-)

> 4. Block arguments and block-local variables

Block arguments and block local variables are local to the block
scope, not the method.

> 5. Stabby Lambda variables

What do you mean by this?

> 6. Rescue exception naming (rescue StandardError => err)

Kind of assignment :-)

> 7. Named Regexp captures in literal matches (/name: (?<person>\w+)/ =~
> 'name: Mike' creates a local variable named "person" with value
> "Mike")

Didn't knew this one, thanks.

Jesus.