3 module ActiveSupport #:nodoc:
4 module CoreExtensions #:nodoc:
7 # Iterate over an array in groups of a certain size, padding any remaining
8 # slots with specified value (<tt>nil</tt> by default) unless it is
13 # %w(1 2 3 4 5 6 7).in_groups_of(3) {|g| p g}
18 # %w(1 2 3).in_groups_of(2, ' ') {|g| p g}
22 # %w(1 2 3).in_groups_of(2, false) {|g| p g}
25 def in_groups_of(number, fill_with = nil, &block)
29 # size % number gives how many extra we have;
30 # subtracting from number gives how many to add;
31 # modulo number ensures we don't add group of just fill.
32 padding = (number - size % number) % number
33 collection = dup.concat([fill_with] * padding)
37 collection.each_slice(number, &block)
39 returning [] do |groups|
40 collection.each_slice(number) { |group| groups << group }
45 # Divide the array into one or more subarrays based on a delimiting +value+
46 # or the result of an optional block.
50 # [1, 2, 3, 4, 5].split(3) # => [[1, 2], [4, 5]]
51 # (1..10).to_a.split { |i| i % 3 == 0 } # => [[1, 2], [4, 5], [7, 8], [10]]
52 def split(value = nil, &block)
53 block ||= Proc.new { |e| e == value }
55 inject([[]]) do |results, element|
56 if block.call(element)
59 results.last << element