From: Robert Klemme <shortcutter@...>
Date: 2009-06-08T02:05:07+09:00
Subject: Re: adding, multiplying array

On 07.06.2009 17:31, Rick DeNatale wrote:
> On Sun, Jun 7, 2009 at 10:15 AM, Haris
> Bogdanović<haris.bogdanovic@gmail.com> wrote:

>> a.zip(b).map {|i,j| i*j} (don't really know how that works)
> 
> zip weaves two enumerables together and creates a new enumerable:
> 
> a.zip(b) # => [[2, 3], [2, 3], [2, 3]]

This is true only if you do not provide a block:

irb(main):007:0> a = Array.new 5 do |i| i end
=> [0, 1, 2, 3, 4]
irb(main):008:0> b = Array.new 5 do |i| i * 2 end
=> [0, 2, 4, 6, 8]
irb(main):009:0> a.zip(b) {|x,y| printf "%d - %d\n",x,y}
0 - 0
1 - 2
2 - 4
3 - 6
4 - 8
=> nil

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/