I needed to format numbers with commas to make it more human
readable. Here''s how I did it.
def commify(number)
c = { :value => "", :length => 0 }
r = number.to_s.reverse.split("").inject(c) do |t, e|
iv, il = t[:value], t[:length]
iv += '','' if il % 3 == 0 && il != 0
{ :value => iv + e, :length => il + 1 }
end
r[:value].reverse!
end
Am interested in how many better ways there are to do it. Maybe even
a one liner ...
-- G.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://wrath.rubyonrails.org/pipermail/rails/attachments/20060124/911fe8f8/attachment.html
Guido Sohne wrote:> I needed to format numbers with commas to make it more human > readable. Here''s how I did it. > > def commify(number) > c = { :value => "", :length => 0 } > r = number.to_s.reverse.split("").inject(c) do |t, e| > iv, il = t[:value], t[:length] > iv += '','' if il % 3 == 0 && il != 0 > { :value => iv + e, :length => il + 1 } > end > r[:value].reverse! > end > > Am interested in how many better ways there are to do it. Maybe even > a one liner ... > > -- G.Here''s how I did it recently num_with_commas = number.to_s.reverse.gsub(/(\d{3})/,"\\1,").chomp(",").reverse Note that this will run into trouble if you have decimal points in it. If you do, just cut off that part of the string and paste it back on after you add the commas. _Kevin -- Posted via http://www.ruby-forum.com/.
On 1/24/06, Guido Sohne <guido.sohne@gmail.com> wrote:> > I needed to format numbers with commas to make it more human readable. > Here''s how I did it. > > def commify(number) > c = { :value => "", :length => 0 } > r = number.to_s.reverse.split("").inject(c) do |t, e| > iv, il = t[:value], t[:length] > iv += '','' if il % 3 == 0 && il != 0 > { :value => iv + e, :length => il + 1 } > end > r[:value].reverse! > end > > Am interested in how many better ways there are to do it. Maybe even a one > liner ... > > -- G. >Check out NumberHelper in the API, it is a one liner: *number_with_delimiter*(number, delimiter=",") Formats a number with a delimiter. Example: number_with_delimiter(12345678) => 12,345,678 [ hide source <javascript:toggleSource(''M000363_source'')> ] # File vendor/rails/actionpack/lib/action_view/helpers/number_helper.rb, line 75 75: def number_with_delimiter(number, delimiter=",") 76: number.to_s.gsub(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{delimiter}") 77: end _______________________________________________> Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails > > >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060124/2ec7fc20/attachment.html
The gsub approach is much nicer. Exactly what I was looking for. Thanks! -- G. On Jan 24, 2006, at 6:12 PM, David Clements wrote:> > > On 1/24/06, Guido Sohne <guido.sohne@gmail.com> wrote: > I needed to format numbers with commas to make it more human > readable. Here''s how I did it. > > def commify(number) > c = { :value => "", :length => 0 } > r = number.to_s.reverse.split("").inject(c) do |t, e| > iv, il = t[:value], t[:length] > iv += '','' if il % 3 == 0 && il != 0 > { :value => iv + e, :length => il + 1 } > end > r[:value].reverse! > end > > Am interested in how many better ways there are to do it. Maybe > even a one liner ... > > -- G. > > > Check out NumberHelper in the API, it is a one liner: > > number_with_delimiter(number, delimiter=",") > Formats a number with a delimiter. Example: > > number_with_delimiter(12345678) => 12,345,678 > [ hide source ] > > # File vendor/rails/actionpack/lib/action_view/helpers/ > number_helper.rb, line 75 > 75: def number_with_delimiter > (number, delimiter=",") > 76: number. > to_s.gsub(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{delimiter}") > 77: end > > > > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails > > > > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060124/1ca1b465/attachment.html
Guido Sohne wrote:> I needed to format numbers with commas to make it more human readable. > Here''s how I did it. > > def commify(number) > c = { :value => "", :length => 0 } > r = number.to_s.reverse.split("").inject(c) do |t, e| > iv, il = t[:value], t[:length] > iv += '','' if il % 3 == 0 && il != 0 > { :value => iv + e, :length => il + 1 } > end > r[:value].reverse! > end > > Am interested in how many better ways there are to do it. Maybe even a > one liner ...Depends what you count as one line :-) def commify(v) (s=v.to_s;x=s.length;s).rjust(x+(3-(x%3))).scan(/.{3}/).join('','').strip end Doesn''t work for negative numbers, though, but it''s quite fun... This works, but is boring: v.to_s.reverse.gsub(/(\d{3})(?=\d)/x,''\1,'').reverse -- Alex
On Jan 24, 2006, at 6:38 PM, Alex Young wrote:> def commify(v) > (s=v.to_s;x=s.length;s).rjust(x+(3-(x%3))).scan(/.{3}/).join > ('','').strip > endI tried to mess with the regex, /.{3}/ to get it to ignore ''.''s and stuff following it, but that breaks the neat slicing in three''s ... unless x=s.length - s.scan(/\..*/) ... So far, only the gsub approach works for floating point numbers ... but only if they have two or fewer digits past the ''.'' ... irb(main):024:0> v = 1000000.0101 => 1000000.0101 irb(main):025:0> v.to_s.reverse.gsub(/(\d{3})(?=\d)/x,''\1,'').reverse => "1,000,000.0,101" irb(main):026:0> So which is gonna win when doing the floats? gsub or rjust+scan ? :-) I like both approaches ... -- G.
After a good bit of hassle, I finally got Locomotive working on my OS
X box. Because it seems more comfortable with SQLite than with MySQL,
I''m using the former for the moment in preparation for the Rails
Studio in Pasadena this week.
I ran into a tiny issue which I''d like to understand better.
I created a SQLite table in the usual way:
sqlite3 depot_developer
Then I created a text table-creating file called create_products.sql
and stuck in the db folder of the Rails app''s directory.
Then I switched to the db directory, launched sqlite3 and instructed
it to .read the newly created SQL file. It appeared to work
flawlessly. Indeed, when I ask SQLite3 for the .tables, I see the
products table there. Cool.
Then I tried to create the scaffold for the project and I got an error:
create test/fixtures/products.yml
error Before updating scaffolding from new DB schema, try
creating a table for your model (Product)
I tried again with the same result.
So I deleted the depot_development database and then looked at the
Locomotive video where I saw that it created a new database with an
initial table by:
sqlite3 depot_development < create_products.sql
This seemed kind of strange to me but I tried it and then ran the
scaffolding generation and it worked fine (or at least reported no
error).
Can anyone tell me why this happened? My big concern at the moment is
that the next time I need to add a table to this depot_development
database I don''t want to lose my existing table by using the
"<"
syntax rather than reading the table-creation SQL inside SQLite.
Thanks.
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
Dan Shafer
Technology Visionary - Technology Assessment - Documentation
"Looking at technology from every angle"
http://www.eclecticity.com
You can ignore this question for my purposes, though it might be of general interest. I decided after seeing how SQLite datatype support worked that I would see if I could get MySQL working anyway. To my amazement, it came right up and did what I expected. So I''m back using MySQL and thus able to follow the Agile book much more easily. -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-. -.-.-.-.-.-.-.-.-.-.-.-.-.-.- Dan Shafer Technology Visionary - Technology Assessment - Documentation "Looking at technology from every angle" http://www.eclecticity.com