From: "Serdar Kılıç" <skilic@...>
Date: 2006-01-31T15:23:58+09:00
Subject: Re: Array prepending nil object

Thanks Joel. I did actually use irb but only through MINGW on WindowsXP, where unfortunately you don't get the descriptive "code/linemarker" thingys.
On 31/01/06, Joel VanderWerf <vjoel@path.berkeley.edu> wrote:> Serdar K�l�� wrote:> > I'm going through Brian Schr�der's tutorial and hit a small snag. The> > code is (on page 16):> >> > print 'Array as stack: '> > stack = Array.new()> > stack.push('a')> > stack.push('b')> > stack.push('c')> > print stack.pop until stack.empty?> >> > The display that I'm getting is:> > Array as stack: cbanil> >> > So somehow nil is creeping it's way into my array but I'm not sure> > how. Any ideas?>> The nil is just the return value of the last expression, not part of the> output of the print calls.>> You can see it more clearly in irb:>> irb(main):001:0> print 'Array as stack: '> Array as stack: => nil> irb(main):002:0> stack = Array.new()> => []> irb(main):003:0> stack.push('a')> => ["a"]> irb(main):004:0> stack.push('b')> => ["a", "b"]> irb(main):005:0> stack.push('c')> => ["a", "b", "c"]> irb(main):006:0> print stack.pop until stack.empty?> cba=> nil>> The printed output shows up on the left of the =>.>> -->       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407>>

--Cheers,Serdar Kilichttp://weblog.kilic.net/