On Wed, Dec 30, 2009 at 2:16 PM, Rob Biedenharn <[email protected]>wrote:
> On Dec 30, 2009, at 4:08 PM, Frederick Cheung wrote: > > On Dec 30, 6:39 pm, webbieguy <[email protected]> wrote: > >> Hi, > >> > >> I have a very simple problem. I am a newbie to rails and for the life > >> of me can't figure out why a simple incrementing loop is not printing > >> to screen correctly. I know this has to be something simple but can't > >> find anything specific to my problem. > >> > >> <%= > >> for i in 0..10 do > >> puts "i is now #{i}" > >> end > >> %> > >> > > Because in a view you don't use puts (puts either goes nowhere or to a > > logfile somewhere). > > The <%= stuff the result of the chunk of code into the view, for a > > 'for' statement like you've got there then the result is the thing > > iterated over (ie 0..10). > > > > you want something more like > > > > <% looping construct of your choice do %> > > i is now <%= i %> > > <% end %> > > > > Fred > > In addition to what Fred says, your other problem is that you have: > for i in <Range> do > #stuff > end > Actually, in the above, the 'do' is optional for both 'while', 'until, and 'for' loops in both Ruby 1.8.x and 1.9.x. Thus, the above is legal Ruby. Furthermore, one can write the above using a colon as follows in Ruby 1.8.x: for i in <Range> : #stuff end -Conrad > and you want: (note there's no 'do' on a for loop) > for i in <Range> > #stuff > end > so that would be: > for i in 0..10 > #stuff > end > > You're getting "0..10" because that's the value of the expression in > the <%= %> > Try this in irb and you'll see. > irb> for i in 0..10 > irb> puts i > irb> end > 0 > 1 > 2 > 3 > 4 > 5 > 6 > 7 > 8 > 9 > 10 > => 0..10 > irb> > > > It's more likely, you want to have: > > <% (0..10).each do |i| %> > i is now <%= i %> > <% end %> > > The difference being mainly that the local variable i will only exist > inside the block and iterating over a collection using .each is much > more common. See James Gray's article "Shades of Gray: The Evils of > the For Loop" for a more thorough explanation. > > http://blog.grayproductions.net/articles/the_evils_of_the_for_loop > > -Rob > > >> Prints to screen "0..10" as opposed to what I want: > >> > >> 0 > >> 1 > >> 2 > >> 3 > >> 4 > >> 5 > >> 6 > >> 7 > >> 8 > >> 9 > >> 10 > >> > >> Can someone help me with this very simple problem. I have tried > >> until, .times, and while loops to no avail. So there must be some > >> type > >> of syntax magic I am missing. > >> > >> Thanks in advance, > >> Justin > > > > -- > > > > You received this message because you are subscribed to the Google > > Groups "Ruby on Rails: Talk" group. > > To post to this group, send email to rubyonrails- > > [email protected]. > > To unsubscribe from this group, send email to > [email protected]<rubyonrails-talk%[email protected]> > > . > > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en > > . > > > > > > Rob Biedenharn http://agileconsultingllc.com > [email protected] > > > > -- > > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<rubyonrails-talk%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
