From: David Milne <djomilne@...>
Date: 2004-01-09T00:31:41+09:00
Subject: I don't understand this behavour, is it a bug?

Please I wonder if any one can give me some advice?

I thought I would get into Ruby by "writing BASIC scripts  in Ruby". I
thought I would try to write one script fragment each day.
My latest script fragment has a behavour which I do not understand. Is it a
bug?

I give variable one a value of [1, 2, 3, 4, 5] . I then set variables two
and three equal to variable one. I then do stuff to three using one to give
three the value [1, 3, 6, 10, 15]. My little scrip then prints out variables
one, two and three. I am amazed to find that one and two appear in the
printout to have altered them selves to look like three, that is one == two
== three == [1, 3, 6, 10, 15].
WHY?? How on earth can one and two have altered themselves.

According to the help menu version screen I used RubyWin 0.0.38  Ruby 1.6.5
Scintilla 1.38

This is my little ruby scrip file that I ran on Rubywin: PLEASE NOT I HAVE A
KOREAN COMPUTER WHICH SHOWS THE BACK SLASH AS THE KOREAN MONEY SYMBOL \ =
WON

puts " Get length of number series: "

upto = (gets.strip).to_i
puts "\n"

one = (1..upto).to_a
two = one
three = one

three[0] = one[0]
for i in 1..(one.length - 1)
  three[i] = one[i] + three[i-1]
end

puts one
puts "\n"
puts two
puts "\n"
puts three

And this appeared on the Console ( I do not understand, I thought I should
get 1 2 3 4 5  1 2 3 4 5   1 3 6 10 15 )

Get length of number series:
5

1
3
6
10
15

1
3
6
10
15

1
3
6
10
15