From: Andrew Cowan <icculus@...>
Date: 2001-10-20T05:46:24+09:00
Subject: [ruby-talk:22799] Re: Creating variables with dynamic names ?

Avi Bryant wrote:

> On Sat, 20 Oct 2001, Julian Fitzell wrote:
> 
>> var_name = "myVar"
>> eval "#{var_name} = 10"
>> myVar                             => 10
> 
> Although that will work in IRB, it won't work in general, because
> eval creates a new scope.  So this would work:
> 
> myVar = 1
> var_name = "myVar"
> eval "#{var_name} = 10"
> myVar => 10
> 
> but if myVar isn't already defined it will only last for the scope of the
> eval.
> 
> I can't think of any good way of getting that effect, but I will say that
> in most cases, I would expect there to be a better way to solve the
> problem.
> 
> On the other hand, if you're using instance variables instead of locals,
> it should work fine:
> 
> var_name = "@myVar"
> eval "#{var_name} = 10"
> @myVar => 10
> 
> Globals ought to work too.
> 
> Avi
> 
>> On 20/10/2001 at 1:25 AM Andrew Cowan wrote:
>>
>> >I am somewhat new to Ruby, coming from about 10 years of Perl
>> >programming,
>> >6 professionally.
>> >
>> >In perl, it is easy to create new variables with variable names that are
>> >defined in another variable. For example:
>> >
>> >$var_name = "myVar";
>> >${"$var_name"} = 10;
>> >
>> >would define a new variable $myVar the value 10.
>> >
>> >Is there a way to do this in Ruby? I suspect there must be but haven't
>> >been
>> >able to figure this out yet.
>> >
>> >Thanks for any help you can offer!
>> >
>> >Andy
>> >
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>>
> 
> 
> 




Was just going to post that indeed it does work, and then I realized I was 
using instance variables. ;)

Thanks for the followup!


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