# File lib/active_support/core_ext/array/grouping.rb, line 59 def in_groups(number, fill_with = nil) # size / number gives minor group size; # size % number gives how many objects need extra accomodation; # each group hold either division or division + 1 items. division = size / number modulo = size % number # create a new array avoiding dup groups = [] start = 0 number.times do |index| length = division + (modulo > 0 && modulo > index ? 1 : 0) padding = fill_with != false && modulo > 0 && length == division ? 1 : 0 groups << slice(start, length).concat([fill_with] * padding) start += length end if block_given? groups.each{|g| yield(g) } else groups end end