Module ActiveSupport::CoreExtensions::Array::Grouping
In: vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb

Methods

Public Instance methods

Iterate over an array in groups of a certain size, padding any remaining slots with specified value (nil by default) unless it is false.

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]

  %w(1 2 3).in_groups_of(2, ' ') {|g| p g}
  ["1", "2"]
  ["3", " "]

  %w(1 2 3).in_groups_of(2, false) {|g| p g}
  ["1", "2"]
  ["3"]

[Source]

    # File vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb, line 23
23:         def in_groups_of(number, fill_with = nil, &block)
24:           require 'enumerator'
25:           collection = dup
26:           collection << fill_with until collection.size.modulo(number).zero? unless fill_with == false
27:           grouped_collection = [] unless block_given?
28:           collection.each_slice(number) do |group|
29:             block_given? ? yield(group) : grouped_collection << group
30:           end
31:           grouped_collection unless block_given?
32:         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]]

[Source]

    # File vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb, line 41
41:         def split(value = nil, &block)
42:           block ||= Proc.new { |e| e == value }
43:           inject([[]]) do |results, element|
44:             if block.call(element)
45:               results << []
46:             else
47:               results.last << element
48:             end
49:             results
50:           end
51:         end

[Validate]