From: Kenneth McDonald <kenneth.m.mcdonald@...>
Date: 2008-09-10T09:36:43+09:00
Subject: Re: yield/block question

Very elegant, with the drawback that it requires flattening a  
potentially large array structure.
But that was carelessness in my lack of specifications. A nice  
solution, thank you.

Ken


On Sep 9, 2008, at 7:11 PM, Martin DeMello wrote:

> On Tue, Sep 9, 2008 at 5:04 PM, Kenneth McDonald
> <kenneth.m.mcdonald@sbcglobal.net> wrote:
>> This is something I know how to do in Python, but it's got me  
>> flummoxed in
>> Ruby--I still haven't fully gotten my head around the Ruby way.  
>> ("yield"
>> means something very different in Python and in Ruby.
>>
>> Let's say I have a data structure consisting of nested Arrays and  
>> numbers,
>> for example [[1,2], 3, [[4]]]. I want to write an extension to Array,
>> "each_leaf", which takes a block that will be applied to each number
>> sequentially in that nested array. For example, if arr is the given  
>> array,
>> then
>>
>> result = 0
>> arr.each_leaf {|n| result += n}
>>
>> would end with result being equal to 1+2+3+4
>>
>> Could anyone help out? Much appreciated.
>
> array.flatten.each {|i| yield i}
>
> martin
>