method

in_groups_of

v2.0.3 - Show latest stable - 0 notes - Class: ActiveSupport::CoreExtensions::Array::Grouping

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What's this?

in_groups_of(number, fill_with = nil, &block) public

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, '&nbsp;') {|g| p g}
  ["1", "2"]
  ["3", "&nbsp;"]

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

Show source

# File activesupport/lib/active_support/core_ext/array/grouping.rb, line 25
        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

in_groups_of

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