From: "Jan E." <lists@...>
Date: 2012-12-12T19:23:13+09:00
Subject: Re: How I can create/extract a variable/hash into the current binding in Ruby?

Hi,

I'm no expert on this stuff, but I think it's a problem of the Ruby
interpreter determining variables while it parses the code:

eval 'x = 1'
puts x

This doesn't work, because the parser doesn't "see" the eval stuff. It
doesn't find an assignment for "x", so it assumes it's a method (which
leads to a NameError).

If, however, you set "x" to an arbitrary value beforehands, it correctly
regognizes "x" as a variable:

x = nil
eval 'x = 1'
puts x

Apart from the technical stuff: I don't find it a good idea to just dump
variables into a binding, because it's just too much "magic". It makes 
it hard to keep track of which variable has which value. And I can't 
think of any good reason to do that when you're programming 
object-oriented.

Did you get the idea from PHP? Because that language is notorious for 
dumping values into all kinds of contexts, which has lead and still 
leads to gigantic security problems.

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