# class Array

a method # that walks an array in groups, pass a block to call the block on each sub array

### Public Instance Methods

in_groups_of(chunk_size, padded_with=nil) { |a| ... } click to toggle source

    # File lib/mcollective/monkey_patches.rb, line 29
    def in_groups_of(chunk_size, padded_with=nil, &block)
      arr = self.clone

      # how many to add
      padding = chunk_size - (arr.size % chunk_size)

      # pad at the end
      arr.concat([padded_with] * padding) unless padding == chunk_size

      # how many chunks we'll make
      count = arr.size / chunk_size

      # make that many arrays
      result = []
      count.times {|s| result <<  arr[s * chunk_size, chunk_size]}

      if block_given?
        result.each_with_index do |a, i|
          case block.arity
            when 1
              yield(a)
            when 2
              yield(a, (i == result.size - 1))
            else
              raise "Expected 1 or 2 arguments, got #{block.arity}"
          end
        end
      else
        result
      end
    end