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
29 def in_groups_of(chunk_size, padded_with=nil, &block)
30   arr = self.clone
31 
32   # how many to add
33   padding = chunk_size - (arr.size % chunk_size)
34 
35   # pad at the end
36   arr.concat([padded_with] * padding) unless padding == chunk_size
37 
38   # how many chunks we'll make
39   count = arr.size / chunk_size
40 
41   # make that many arrays
42   result = []
43   count.times {|s| result <<  arr[s * chunk_size, chunk_size]}
44 
45   if block_given?
46     result.each_with_index do |a, i|
47       case block.arity
48         when 1
49           yield(a)
50         when 2
51           yield(a, (i == result.size - 1))
52         else
53           raise "Expected 1 or 2 arguments, got #{block.arity}"
54       end
55     end
56   else
57     result
58   end
59 end