From: Brett Simmers <bsimmers@...>
Date: 2007-07-24T07:55:45+09:00
Subject: Re: Newbie Question: irb

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In irb, "_" represents the previous result, and to go farther back you 
can just assign results to variables. 

irb(main):001:0> a = 1 + 2
=> 3
irb(main):002:0> 5
=> 5
irb(main):003:0> _ + a
=> 8

Mike Halloran wrote:
> How can I access the previous result of an evaluation in the irb
> debugger.
>
> For example:
>
>   
>>> 1 + 2
>>>       
> 3   <-- I want to access this result
>
>   
>>> 5 + {some expression which is '3'}
>>>       
> 8
>
>
> =================
> In lisp it would be:
>
>   
>>> (+ 1 2)
>>>       
> 3
>   
>>> (+ 5 *) <-- use a star to grab one result back
>>>       
> 8
>   
>>> (+ 5 **) <-- use a double start to grab two results back
>>>       
> 8
>
> Anyway, thanks in advance for the help,
>
> Mike
>   

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