Module | ActiveSupport::CoreExtensions::Array::Grouping |
In: |
vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb
|
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"]
# File vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb, line 22 22: def in_groups_of(number, fill_with = nil, &block) 23: if fill_with == false 24: collection = self 25: else 26: # size % number gives how many extra we have; 27: # subtracting from number gives how many to add; 28: # modulo number ensures we don't add group of just fill. 29: padding = (number - size % number) % number 30: collection = dup.concat([fill_with] * padding) 31: end 32: 33: if block_given? 34: collection.each_slice(number, &block) 35: else 36: returning [] do |groups| 37: collection.each_slice(number) { |group| groups << group } 38: end 39: end 40: end
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]]
# File vendor/rails/activesupport/lib/active_support/core_ext/array/grouping.rb, line 47 47: def split(value = nil, &block) 48: block ||= Proc.new { |e| e == value } 49: 50: inject([[]]) do |results, element| 51: if block.call(element) 52: results << [] 53: else 54: results.last << element 55: end 56: 57: results 58: end 59: end