From: 7stud -- <bbxx789_05ss@...>
Date: 2009-08-25T04:10:57+09:00
Subject: Re: help in understanding eval function

Ravi Kanth wrote:
> Hi
> I am new to ruby I am having trouble in understanding the eval function
> 
> can you suggest me a good reference to look at the various classes and
> methods available.
> 
> 

Programming Ruby(2nd ed.) for ruby 1.8.x.
Programming Ruby(3rd ed.) for ruby 1.9.x.

or...

$ri eval
------------------------------------------------------------ Kernel#eval
     eval(string [, binding [, filename [,lineno]]])  => obj
------------------------------------------------------------------------
     Evaluates the Ruby expression(s) in _string_. If _binding_ is
     given, the evaluation is performed in its context. The binding may
     be a +Binding+ object or a +Proc+ object. If the optional
     _filename_ and _lineno_ parameters are present, they will be used
     when reporting syntax errors.

        def getBinding(str)
          return binding
        end
        str = "hello"
        eval "str + ' Fred'"                      #=> "hello Fred"
        eval "str + ' Fred'", getBinding("bye")   #=> "bye Fred"
------------------




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