From 408fe5facc482f84194bbe79865a26b57b2cc883 Mon Sep 17 00:00:00 2001 From: David Heinemeier Hansson Date: Wed, 31 May 2006 23:25:36 +0000 Subject: Added Array#to_s(:db) that'll produce a comma-separated list of ids [DHH] Split Grouping into its own file git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4387 5ecf4fe2-1ee6-0310-87b1-e25e094e27de --- .../lib/active_support/core_ext/array/grouping.rb | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 activesupport/lib/active_support/core_ext/array/grouping.rb (limited to 'activesupport/lib/active_support/core_ext/array/grouping.rb') diff --git a/activesupport/lib/active_support/core_ext/array/grouping.rb b/activesupport/lib/active_support/core_ext/array/grouping.rb new file mode 100644 index 0000000000..6f28e1eb6d --- /dev/null +++ b/activesupport/lib/active_support/core_ext/array/grouping.rb @@ -0,0 +1,46 @@ +module ActiveSupport #:nodoc: + module CoreExtensions #:nodoc: + module Array #:nodoc: + module Grouping + # Iterate over an array in groups of a certain size, padding any remaining + # slots with specified value (nil by default). + # + # E.g. + # + # %w(1 2 3 4 5 6 7).in_groups_of(3) {|g| p g} + # ["1", "2", "3"] + # ["4", "5", "6"] + # ["7", nil, nil] + def in_groups_of(number, fill_with = nil, &block) + require 'enumerator' + collection = dup + collection << fill_with until collection.size.modulo(number).zero? + grouped_collection = [] unless block_given? + collection.each_slice(number) do |group| + block_given? ? yield(group) : grouped_collection << group + end + grouped_collection unless block_given? + end + + # Divide the array into one or more subarrays based on a delimiting +value+ + # or the result of an optional block. + # + # ex. + # + # [1, 2, 3, 4, 5].split(3) # => [[1, 2], [4, 5]] + # (1..10).to_a.split { |i| i % 3 == 0 } # => [[1, 2], [4, 5], [7, 8], [10]] + def split(value = nil, &block) + block ||= Proc.new { |e| e == value } + inject([[]]) do |results, element| + if block.call(element) + results << [] + else + results.last << element + end + results + end + end + end + end + end +end -- cgit v1.2.3