method

in_groups_of

v4.2.7 - Show latest stable - 0 notes - Class: Array

in_groups_of(number, fill_with = nil) public

Splits or 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 8 9 10).in_groups_of(3) {|group| p group}
["1", "2", "3"]
["4", "5", "6"]
["7", "8", "9"]
["10", nil, nil]

%w(1 2 3 4 5).in_groups_of(2, '&nbsp;') {|group| p group}
["1", "2"]
["3", "4"]
["5", "&nbsp;"]

%w(1 2 3 4 5).in_groups_of(2, false) {|group| p group}
["1", "2"]
["3", "4"]
["5"]

Show source

# File activesupport/lib/active_support/core_ext/array/grouping.rb, line 20
  def in_groups_of(number, fill_with = nil)
    if number.to_i <= 0
      raise ArgumentError,
        "Group size must be a positive integer, was #{number.inspect}"
    end

    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(Array.new(padding, fill_with))
    end

    if block_given?
      collection.each_slice(number) { |slice| yield(slice) }
    else
      collection.each_slice(number).to_a
    end
  end

in_groups_of

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