From: Andrew Cowan <icculus@...>
Date: 2001-10-20T04:46:16+09:00
Subject: [ruby-talk:22793] Re: Creating variables with dynamic names ?

Ned Konz wrote:

> On Friday 19 October 2001 09:25 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.
> 
> The usefulness of this is quite limited, unless you're writing an
> interactive environment. Many people just say
> 
>        use strict;
> 
> at the top of their Perl programs and get away with it. And the
> symbolic references like the above will be flagged with warnings.
> 
>> Is there a way to do this in Ruby? I suspect there must be but haven't
>> been able to figure this out yet.
> 
> There's eval, instance_eval, etc.
> 
> $ irb
> irb(main):001:0> a = "abc"
> "abc"
> irb(main):002:0> instance_eval a + "=3"
> 3
> irb(main):003:0> abc
> 3
> 

I dont think the usefulness is limited at all, obviously the code isn't 
meant to be used in other people's code where use strict is being used...
However, I appreciate the example of instance_eval's usage!



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