From: Robert Klemme <bob.news@...>
Date: 2006-02-02T06:54:01+09:00
Subject: Re: [RCR] Numeric#of

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]

Have fun!

Kind regards

    robert