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comp.lang.ruby

Testing use of binding: got spurious error message

RichardOnRails

12/4/2006 1:13:00 AM

Hi All,

The program below ends with eval(...) producing an error message, as
shown in the comments at the end of the code. How can I direct the
offending output to a "bit bucket"?

Thanks in Advance,
Richard

class MyClass
def initialize(n)
@number = n
end

def getBinding
binding()
end
end

def show(a)
a.each do |m|
puts "\t" + m.inspect
end
end

obj1 = MyClass.new 19
bind1 = obj1.getBinding

obj2 = MyClass.new 84
bind2 = obj2.getBinding

puts "number for obj1 = " + eval('@number', bind1).to_s
puts "number for obj2 = " + eval('@number', bind2).to_s

puts "# of methods: " + eval(methods.length.to_s, bind1).to_s
puts "Methods: "
dummy = eval(show(methods), bind1)
puts "That's all folks!"

=begin
# Result:
number for obj1 = 19
number for obj2 = 84
# of methods: 46
Methods:
[snip]
TestBinding.rb:28:in `eval': cannot convert Array into String
(TypeError)
from TestBinding.rb:28
=end
2 Answers

Morton Goldberg

12/4/2006 3:36:00 AM

0

On Dec 3, 2006, at 8:15 PM, Richard wrote:

> class MyClass
> def initialize(n)
> @number = n
> end
>
> def getBinding
> binding()
> end
> end
>
> def show(a)
> a.each do |m|
> puts "\t" + m.inspect
> end
> end
>
> obj1 = MyClass.new 19
> bind1 = obj1.getBinding
>
> obj2 = MyClass.new 84
> bind2 = obj2.getBinding
>
> puts "number for obj1 = " + eval('@number', bind1).to_s
> puts "number for obj2 = " + eval('@number', bind2).to_s
>
> puts "# of methods: " + eval(methods.length.to_s, bind1).to_s
> puts "Methods: "
> # dummy = eval(show(methods), bind1)
show(obj1.methods) # <= insert this
show(eval("methods", bind1)) # <= or this
> puts "That's all folks!"

Regards, Morton

RichardOnRails

12/4/2006 5:28:00 PM

0

Hi Morton,

> show(obj1.methods) # <= insert this
> show(eval("methods", bind1)) # <= or this

That's perfect. Thank you very much.

Incidentally, I trimmed the quotes and sorted the list: a very
satisfying result!

Best wishes,
Richard

Morton Goldberg wrote:
> On Dec 3, 2006, at 8:15 PM, Richard wrote:
>
> > class MyClass
> > def initialize(n)
> > @number = n
> > end
> >
> > def getBinding
> > binding()
> > end
> > end
> >
> > def show(a)
> > a.each do |m|
> > puts "\t" + m.inspect
> > end
> > end
> >
> > obj1 = MyClass.new 19
> > bind1 = obj1.getBinding
> >
> > obj2 = MyClass.new 84
> > bind2 = obj2.getBinding
> >
> > puts "number for obj1 = " + eval('@number', bind1).to_s
> > puts "number for obj2 = " + eval('@number', bind2).to_s
> >
> > puts "# of methods: " + eval(methods.length.to_s, bind1).to_s
> > puts "Methods: "
> > # dummy = eval(show(methods), bind1)
> show(obj1.methods) # <= insert this
> show(eval("methods", bind1)) # <= or this
> > puts "That's all folks!"
>
> Regards, Morton