Forum: Ruby What is wrong in this

$rr_msg = "hello"

task :default do
        display "rr"
end

def display(msg)
        ss = msg+"_msg"
        puts "#{$ss}"
end


My aim is to construct a global var ($rr_msg) and get the value ...

Can any one help me ......

On Tue, Dec 4, 2012 at 12:45 PM, Mallikarjuna Yaddala
<lists@ruby-forum.com> wrote:
>
>
> My aim is to construct a global var ($rr_msg) and get the value ...

You can't construct a variable like that. In order to do this you need
to use eval:

1.9.2p290 :001 > $rr_msg = "test"
 => "test"
1.9.2p290 :002 > var = "rr"
 => "rr"
1.9.2p290 :004 > eval "$#{var}_msg"
 => "test"

But there's another way. Instead of constructing a variable, you could
create a hash whose keys are the "variables":

$messages = {"rr" => "test"} # not sure it needs to be global, but 
whatever

def display message_id
  puts $messages[message_id]
end

display "rr"  #=> test

Jesus.

On Tue, Dec 04, 2012 at 09:00:56PM +0900, Jes