From: James Edward Gray II <james@...>
Date: 2007-10-26T02:36:59+09:00
Subject: Re: Intervals in Ruby

On Oct 25, 2007, at 12:28 PM, Joel VanderWerf wrote:

> James Edward Gray II wrote:
>> On Oct 25, 2007, at 1:40 AM, Robert Klemme wrote:
>>> Both range versions come in handy, for example, if you need to  
>>> iterate through an array using an index counter then the triple  
>>> dot is convenient because you do not need to to math:
>>>
>>> for i in 0...ar.size
>>>   puts ar[i]
>>> end
>>>
>>> #times is an alternative here
>>>
>>> ar.size.times do |i|
>>>   puts ar[i]
>>> end
>>  >> letters = (0..9).map { |i| (?a + i).chr }
>> => ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"]
>>  >> letters.each_index do |i|
>> ?>   puts letters[i]
>>  >> end
>> a
>> b
>> c
>> d
>> e
>> f
>> g
>> h
>> i
>> j
>> => ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"]
>
> What was that example meant to show? Must be something other than  
> this:
>
> puts ("a".."j").to_a

Yeah, that was dumb of me.  That wasn't the point though.  I was  
showing each_index() which was recreated above in two different ways.

James Edward Gray II