From: "Bartosz Dziewoński" <matma.rex@...>
Date: 2011-10-05T01:32:48+09:00
Subject: Re: Local vs method vs instance (was: Operator Overloading)

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)
3. Formal arguments to a method
4. Block arguments and block-local variables
5. Stabby Lambda variables
6. Rescue exception naming (rescue StandardError => err)
7. Named Regexp captures in literal matches (/name: (?<person>\w+)/ =~
'name: Mike' creates a local variable named "person" with value
"Mike")

(The above borrowed from https://github.com/michaeledgar/ripper-plus)


Ah, the joys of high-level programming :D

-- Matma Rex