| Module | ActiveSupport::CoreExtensions::Array::Grouping |
| In: |
vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb
|
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"]
# File vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb, line 25
25: def in_groups_of(number, fill_with = nil, &block)
26: if fill_with == false
27: collection = self
28: else
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)
34: end
35:
36: if block_given?
37: collection.each_slice(number, &block)
38: else
39: returning [] do |groups|
40: collection.each_slice(number) { |group| groups << group }
41: end
42: end
43: 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]]
# File vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb, line 52
52: def split(value = nil, &block)
53: block ||= Proc.new { |e| e == value }
54:
55: inject([[]]) do |results, element|
56: if block.call(element)
57: results << []
58: else
59: results.last << element
60: end
61:
62: results
63: end
64: end