http://snippets.dzone.com/posts Wed, 20 Aug 2008 20:37:13 GMT DZone Snippets: ruby code http://snippets.dzone.com/posts/show/4099 Takes an Array and turns consecutive integers into Range objects. <br /> <br /><code> <br />class Array <br /> def collapse_ranges <br /> return self if self.length <= 2 <br /> self.uniq! <br /> self.sort! rescue nil <br /> temp_array, return_array = [], [] <br /> self.each_with_index do |item, i| <br /> if item.respond_to?(:next) <br /> temp_array.push item <br /> if item.next != self[i + 1] <br /> return_array.concat 3 <= temp_array.length ? <br /> [temp_array.first..temp_array.last] : <br /> temp_array <br /> temp_array.clear <br /> end <br /> else <br /> return_array.concat 3 <= temp_array.length ? <br /> [temp_array.first..temp_array.last] : <br /> temp_array <br /> temp_array.clear <br /> return_array.push item <br /> end <br /> end <br /> return return_array <br /> end <br />end <br /></code> <br /> <br /><code> <br />>> [1, 3, 4, 5, 7, 8].collapse_ranges.join(', ') <br />=> 1, 3..5, 7, 8 <br />>> %w(a c d e g i j).collapse_ranges.join(', ') <br />=> a, c..e, g, i, j <br />>> [1, 2.5, 3, 4, 5].collapse_ranges.join(', ') <br />=> 1, 2.5, 3..5 <br />>> [1, 2, 3, 4, {:test => 'value'}, 5].collapse_ranges.join(', ') <br />=> 1..4, testvalue, 5 <br /></code> Sun, 03 Jun 2007 17:59:53 GMT http://snippets.dzone.com/posts/show/4099 sporkyy (Todd Sayre) http://snippets.dzone.com/posts/show/3322 This works fine for integers and letters. It should work for anything though, so long as Ruby can form an range from the first and last array items. <br /> <br /><code> <br />class Array <br /> def missing_items <br /> return [] if self.length <= 1 <br /> self.uniq! <br /> self.sort! rescue nil <br /> begin <br /> (self.first..self.last).to_a - self <br /> rescue <br /> [] <br /> end <br /> end <br />end <br /></code> <br /> <br /><code> <br />>> [1, 3, 4, 10].missing_items.join(', ') <br />=> 2, 5, 6, 7, 8, 9 <br />>> [1, 2, 7, 7.5, 8.2].missing_items.join(', ') <br />=> 3, 4, 5, 6, 8 <br />>> %w(a b c f g j).missing_items.join(', ') <br />=> d, e, h, i <br />>> [2.5, {:test => 'value'}].missing_items.join(', ') <br />=> <br /></code> Thu, 18 Jan 2007 08:15:54 GMT http://snippets.dzone.com/posts/show/3322 sporkyy (Todd Sayre) http://snippets.dzone.com/posts/show/3204 Returns an array whose elements are the percentage of each element compared to the maximum element in the array. <br /> <br /><code>>> [25, 150, 200, 5, 75, 125].percentages_of_maximum <br />=> [12, 75, 100, 2, 37, 62]</code> <br /> <br />If you're using Rails, stick this in your "environment.rb" script in the "config" directory: <br /> <br /><code>class Array <br /> def percentages_of_maximum <br /> self.collect{ |i| ((i.to_f / self.sort.last.to_f) * 100).to_i } <br /> end <br />end</code> Tue, 26 Dec 2006 07:16:14 GMT http://snippets.dzone.com/posts/show/3204 sporkyy (Todd Sayre) http://snippets.dzone.com/posts/show/2580 I needed a short and intuitive way of showing dates, so rather than just making something up I decided to steal Google's short date format from Gmail. I'm sure they did usability studies and whatnot. <br /> <br /><code>ActiveSupport::CoreExtensions::Time::Conversions::DATE_FORMATS.merge!( <br /> :gmail => lambda { |date| <br /> Time.now.beginning_of_day <= date ? <br /> "#{date.strftime('%I').to_i}:#{date.strftime('%M')} #{date.strftime('%p').downcase}" : <br /> Time.now.beginning_of_year <= date ? <br /> "#{date.strftime('%b')} #{date.day}" : <br /> "#{date.month}/#{date.day}/#{date.strftime('%y')}" <br /> } <br />) <br /> <br />ActiveSupport::CoreExtensions::Date::Conversions::DATE_FORMATS.merge!( <br /> :gmail => lambda { |date| <br /> Time.now.beginning_of_day <= date ? <br /> "#{date.strftime('%I').to_i}:#{date.strftime('%M')} #{date.strftime('%p').downcase}" : <br /> Time.now.beginning_of_year <= date ? <br /> "#{date.strftime('%b')} #{date.day}" : <br /> "#{date.month}/#{date.day}/#{date.strftime('%y')}" <br /> } <br />)</code> <br /> <br />Put this code in your "environmen.rb" file in your "RAILS_ROOT/config" directory or make a new Ruby script file containing it in your "RAILS_ROOT/config/initializers" directory. Mon, 11 Sep 2006 05:47:42 GMT http://snippets.dzone.com/posts/show/2580 sporkyy (Todd Sayre) http://snippets.dzone.com/posts/show/2323 Uses HTML entities to display pretty fractional values for applicable floating point numbers. <br /> <br /><code> <br />class Float <br /> def html_fraction <br /> self.to_s. <br /> sub(/(.+)\.0$/, '\1' ). # Zero decimal <br /> sub(/(-?\d+)\.25$/, '\1&frac14;'). # One quarter <br /> sub(/(-?\d+)\.5$/, '\1&frac12;'). # One half <br /> sub(/(-?\d+)\.75$/, '\1&frac34;'). # Three quarters <br /> sub(/^(-?)0(&.+)/, '\1\2' ) # Strip leading zeroes <br /> end <br />end <br /></code> <br /> <br />And it works something like this: <br /> <br /><code> <br />>> (0.1).html_fraction <br />=> 0.1 <br />>> (0.25).html_fraction <br />=> &frac14; <br />>> (0.50).html_fraction <br />=> &frac12; <br />>> (0.75).html_fraction <br />=> &frac34; <br />>> (1.0).html_fraction <br />=> 1.0 <br />>> (2.25).html_fraction <br />=> 2&frac14; <br />>> (3.5).html_fraction <br />=> 3&frac12; <br />>> (4.75).html_fraction <br />=> 4&frac34; <br />>> (5.85).html_fraction <br />=> 5.85 <br />>> (-1.5).html_fraction <br />=> -1&frac12; <br />>> (-1.6).html_fraction <br />=> -1.6; <br />>> (-0.25).html_fraction <br />=> -&frac14; <br /></code> Mon, 24 Jul 2006 21:14:06 GMT http://snippets.dzone.com/posts/show/2323 sporkyy (Todd Sayre)