Module: ActiveSupport::CoreExtensions::Array::Grouping
- Included in:
- Array
- Defined in:
- lib/active_support/core_ext/array/grouping.rb
Instance Method Summary collapse
-
#in_groups_of(number, fill_with = nil, &block) ⇒ Object
Iterates over the array in groups of size
number
, padding any remaining slots withfill_with
unless it isfalse
. -
#split(value = nil, &block) ⇒ Object
Divides the array into one or more subarrays based on a delimiting
value
or the result of an optional block.
Instance Method Details
#in_groups_of(number, fill_with = nil, &block) ⇒ Object
Iterates over the array in groups of size number
, padding any remaining slots with fill_with
unless it is false
.
%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"]
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# File 'lib/active_support/core_ext/array/grouping.rb', line 22 def in_groups_of(number, fill_with = nil, &block) if fill_with == false collection = self else # size % number gives how many extra we have; # subtracting from number gives how many to add; # modulo number ensures we don't add group of just fill. padding = (number - size % number) % number collection = dup.concat([fill_with] * padding) end if block_given? collection.each_slice(number, &block) else returning [] do |groups| collection.each_slice(number) { |group| groups << group } end end end |
#split(value = nil, &block) ⇒ Object
Divides the array into one or more subarrays based on a delimiting value
or the result of an optional block.
[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]]
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# File 'lib/active_support/core_ext/array/grouping.rb', line 47 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 |