Re: how to get access to the comparison passed

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From	Robert Klemme <shortcutter@googlemail.com>
Newsgroups	comp.lang.ruby
Subject	Re: how to get access to the comparison passed
Date	Mon, 29 Aug 2016 21:42:38 +0200
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On 29.08.2016 16:49, Mario Ruiz wrote:
> If I have a method like this:
>
> def my_method(comp)
>  #I know this is not working but to understand what I want
>  puts comp.to_s
>  return comp
> end
>
>
> my_method(4==6)
> # my_method will return false and print out 4==6
>
> b=7
> c=9
> life=false
> my_method(b<456)
> #my_method will return true and print out b<456
>
> my_method(c>=b)
> #my_method will return true and print out c>=b
>
> my_method(life)
> #my_method will return false and print out life
>
> is that possible?

Sort of, but eval is a security risk:

def my_method(comp, binding)
   puts comp
   eval(comp, binding)
end

x = 10
y = 20
my_method "x > y", binding

There is a gem which presumably lets you get rid of the second argument:
https://rubygems.org/gems/binding_of_caller/

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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how to get access to the comparison passed Mario Ruiz <tcblues@gmail.com> - 2016-08-29 07:49 -0700
  Re: how to get access to the comparison passed Robert Klemme <shortcutter@googlemail.com> - 2016-08-29 21:42 +0200
    Re: how to get access to the comparison passed Mario Ruiz <tcblues@gmail.com> - 2016-08-30 05:48 -0700

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