From: Robert Klemme <bob.news@...>
Date: 2006-02-02T06:54:16+09:00
Subject: Re: [RCR] Numeric#of

Robert Klemme wrote:
> Martin DeMello wrote:
>> Phil Duby <newshoundat@atphriendly.atnet> wrote:
>>> 
>>> I was looking for a clean (Ruby) way of creating an array of
>>> ascending integer values, with the final value zero.  IE [ 1, 2, 3,
>>> 4, 0 ]
>>> i = 0; a = Array.new( 4 ) { i += 1 }.push 0
>>> does what I want.
>> 
>> (1..4).to_a.push(0)
>> 
>> also Array.new passes in the index to the block, so you can do
>> 
>> Array.new(4) {|i| i+1}
> 
> Here are some more alternatives including a solution with the famous
> #inject. :-)
> 
>>> a=Array.new(5) {|i| (i+1)%5}
> => [1, 2, 3, 4, 0]
>>> a=(1..4).to_a << 0
> => [1, 2, 3, 4, 0]
>>> a=(1..5).inject([]) {|ar,i| ar << (i%5)}
> => [1, 2, 3, 4, 0]
>>> a=(1..5).inject([]) {|ar,i| ar << i} << 0
> => [1, 2, 3, 4, 5, 0]

Pardon me, the last one should've read:

>> a=(1..4).inject([]) {|ar,i| ar << i} << 0
=> [1, 2, 3, 4, 0]

    robert