Testing use of binding: got spurious error message

ruby-talk
1

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

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

···

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

3

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