From: Stefano Crocco <stefano.crocco@...>
Date: 2007-06-16T18:48:32+09:00
Subject: Re: including range error

Alle sabato 16 giugno 2007, Josselin ha scritto:
> I wrote the following command
>
> myRanges = [(0...2), (2...5), (5...10), (10...15), (15...25)]
>
> myRanges.each_pair {|index, aRange| index if aRange.include?(1)}
> I would like to get 0 as a result since  1 is falling into the first
> range....
>
> but I got an error
>
> undefined method `each_pair' for [0...2, 2...5, 5...10, 10...15,
> 15...25]:Array
>
> how should I write it, if I want to get the index of the range where a
> given number is falling...
>
> thanks for your help
>
> joss

each_pair is not a method of Array. If you need both the index and the element 
in the block, you need to use each_with_index, which passes the block the 
element and the index. Your code would become:

myRanges.each_with_index{|aRange, index| index if aRange.include?(1)}

This removes the error, but doesn't give the result you expect, because 
each_with_index returns the receiver (myRanges), in this case. If you want to 
stop the iteration when a range including 1 is found, and return its index, 
you need to break the loop explicitly:

myRanges.each_with_index{|aRange, index| break index if aRange.include(1)}

I hope this helps

Stefano