L/SH/ScotRug Code Golf

golf.rb

g=Golf=Hash
def g.method_missing s, a
  k=[]
  case s.to_s[-1]
  when ?1
    a.reduce :*
  when ?2
    a.split.sort_by{|i| i[1] }*' '
  when ?3
    h1 1..a
  when ?4
    a.map { |i| i.
      sub(/(man.*)/,'hat(\1)').
      sub(/(dog.*)\)/,'\1(bone))').
      sub 'cat','dead'
    }
  when ?5
    a.size.times { |i| k += a.each_cons(i+1).to_a }
    k
  when ?6
    f="fizz"
    b="buzz"
    (1..a).map { |s|  s%3 > 0 ? s%5 > 0 ? s : b  : s%15>0 ? f : f+b }
  when ?7
    *r=0
    l,x=a
    m=l
    a.map {|a|
     x ? x=$_ : (m+=1) == a ? r[-1]=[l,a]*'-' : r<<l=m=a
    }
    r
  when ?8
    *i=0,1
    a.times { i << i[-1]+i[-2] }
    i[1..-2]
  when ?9
    b = open(a).map {|e| e.chomp.split ', '}
    g = z b
    while (c,d = g.minmax_by {|e,s| s.size})[0][1].size*2 < b.size
      b.select {|e,| e==c[0]}.map &:shift
      b -= [k]
      g = z b
    end
    d[0]
  when ?z
    a.group_by {|e,| e}
  end
end

602 is about as good as it gets for this route I think