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
%>
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
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On Dec 30, 6:39 pm, webbieguy [email protected] wrote:
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
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
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<% 0.upto(10) do |i| %>
i is now <%= i %>
<% end %>
On Dec 30, 1:39 pm, webbieguy [email protected] wrote:
end
6
Justin
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On Dec 30, 2009, at 4:08 PM, Frederick C. wrote:
puts “i is now #{i}”
<% 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 do
#stuff
end
and you want: (note there’s no ‘do’ on a for loop)
for i in
#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 G.'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
8
Rob B. http://agileconsultingllc.com
[email protected]
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Thank you! I figured it was just a simple thing I was doing wrong.
Much appreciation!!
Justin
On Dec 30, 4:23 pm, David [email protected] wrote:
I have a very simple problem. I am a newbie to rails and for the life
Prints to screen “0…10” as opposed to what I want:
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.
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On Wed, Dec 30, 2009 at 2:16 PM, Rob B.
[email protected]wrote:
for i in 0…10 do
you want something more like
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 :
#stuff
end
-Conrad
the <%= %>
6
<% (0…10).each do |i| %>
-Rob
7
Justin
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