# \[Fw: Ruby question about irb\]

**URL:** <https://www.ruby-forum.com/t/fw-ruby-question-about-irb/151939>\
**Category:** Development\
**Created:** [October 28, 2008, 5:21am UTC](https://www.ruby-forum.com/t/fw-ruby-question-about-irb/151939 "2008-10-28T05:21:42Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [October 28, 2008, 5:21am UTC](https://www.ruby-forum.com/t/fw-ruby-question-about-irb/151939/1 "2008-10-28T05:21:42Z")

</div>

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[Why is irb different from script file? - Ruby - Ruby-Forum](http://www.ruby-forum.com/topic/168986#new)

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–

## in irb

> > def why?  
> > end  
> > =\> nil  
> > Object.public\_instance\_methods.include?(“why?”)  
> > =\> true

## in test.rb

## def why? end p Object.private\_instance\_methods.include?(“why?”) # =\> true

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binding = eval(“def irb\_binding; binding; end; irb\_binding”,  
TOPLEVEL\_BINDING)

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eval(“def foo; end”, binding)

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\_\_  
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----------------------------------\>\> e-mail: removed\_email\_address@domain.invalid \<\<—

---

<div class="post-metadata">

**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [October 30, 2008, 10:00am UTC](https://www.ruby-forum.com/t/fw-ruby-question-about-irb/151939/2 "2008-10-30T10:00:30Z")

</div>

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In message “Re: [ruby-dev:36969] [Fw: Ruby question about irb]”  
on Tue, 28 Oct 2008 13:20:35 +0900, removed\_email\_address@domain.invalid (Keiju  
ISHITSUKA) writes:

| eval(“def foo; end”, binding)  
|  
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|  
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|  
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