From: Martin Kahlert <martin.kahlert@...>
Date: 2001-11-19T18:41:54+09:00
Subject: [ruby-talk:25834] HowTo deal with arrays?

Hi!
I want to do something like that:

a = Array.new(1000000, 1)
b = Array.new(1000000, 2)
c = Array.new(1000000)

for i in 0 ... a.length
   c[i] = a[i] + b[i] 
end

This looks a bit too C-ish for me.

Should i use
(0 ... a.length).each {|i| c[i] = a[i] + b[i]}
or
a.length.times {|i| c[i] = a[i] + b[i]}
or
a.each_index {|i| c[i] = a[i] + b[i]}

Which is the 'ruby way' of doing that?

Background: I did some timing and found 
a.collect! {|x| x+1}
to be twice as fast as
for i in 0 ... a.length 
  a[i] += 1
end

-- 
The early bird catches the worm. If you want something else for       
breakfast, get up later.