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