From: Sam Duncan <sduncan@...>
Date: 2012-04-12T13:48:57+09:00
Subject: Re: conditionally use greater than or less than

On 12/04/12 16:29, phil rosenstein wrote:
> I ended up doing something like this:
>
>    def threshold_compare(value1, value2, operation)
>      if operation == '>='
>        value1>= value2
>      elsif operation == '<='
>        value1<= value2
>      end
>    end
>
What about just

1.9.2p290 :001 > def threshold_compare(value1, value2, operator='==')
1.9.2p290 :002?>   value1.send(operator.to_sym, value2)
1.9.2p290 :003?> end

Additionally you could add a check for valid operators and see if value1 
responds to the method if you wanted. Something like

if [:==, :>, :<, :>=, :<=].include? operator.to_sym && 
value1.respond_to? operator.to_sym

... and maybe raise an ArgumentError with a helpful message if the 
conditions aren't met.

You might not need to be paranoid about it depending on your context. 
You could also 'bake' the valid operators array into a variable 
somewhere to cut some overhead.

Sam