class Array

# File lib/mobilize-base/extensions/array.rb, line 6
def group_count
  counts = Hash.new(0)
  self.each { |m| counts[m] += 1 }
  return counts
end

# File lib/mobilize-base/extensions/array.rb, line 14
def hash_array_to_tsv
  ha = self
  if ha.first.nil? or ha.first.class!=Hash
    return ""
  end
  max_row_length = ha.map{|h| h.keys.length}.max
  header_keys = ha.select{|h| h.keys.length==max_row_length}.first.keys
  header = header_keys.join("\t")
  rows = ha.map do |r|
    header_keys.map{|k| r[k]}.join("\t")
  end
  ([header] + rows).join("\n")
end

# File lib/mobilize-base/extensions/array.rb, line 3
def sel(&blk)
  return self.select(&blk)
end

# File lib/mobilize-base/extensions/array.rb, line 11
def sum
  return self.inject{|sum,x| sum + x }
end