From: Robert Klemme <shortcutter@...>
Date: 2007-03-27T01:15:05+09:00
Subject: Re: Alternative to switch statements

On 26.03.2007 18:04, aidy wrote:
> Hi,
> 
> I am trying to write a 'keyword-driven test automation framework' in
> Ruby.
> 
> Using a case statement
> 
> <snip>
> def field(name, args)
>   case name
> 
>   when 'username'
>     name='login'
> 
>   when 'password'
>     name='password'
>   end
> 
>   return $ie.text_field(:name, name).set(args)
> 
> end
> 
> def button(name)
>   case name
> 
>   when 'login'
>       name = 'Login'
> 
>     end
> 
>     return $ie.button(:value, name).click
> 
> end
> 
> <snip>
> 
> Calling code
> 
> <snip>
> field 'username', 'x@x.com'
> field 'password', 'password123'
> button 'login'
> <snip>
> 
> I don't like it because
> 
> 1. It is procedural
> 2. Lengthy switch statements may affect performance
> 
> Could anyone suggest a way using, collections or symbols or something
> else?

This is an obvious case for Hash with a custom default value handler:

MAP_FIELD = Hash.new {|h,k| k}.update(
   'username' => 'login'
)

def field(name,args)
   $ie.text_field(:name, MAP_FIELD[name]).set(args)
end

...

Kind regards

	robert