new benchmark with a "Meier" method added
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require 'benchmark' | |
n = 2 | |
#ar = [4,5,6,4,5,6,6,7] | |
maxval = 1000 | |
ar = [].tap{|a| 1_000_000.times {a << rand(maxval)}} | |
puts "SAMPLE of ar" | |
puts ar[0...20] | |
puts "SIZE" | |
puts ar.size | |
puts "MAXVAL" | |
puts maxval | |
Benchmark.bm(15) do |b| | |
b.report("Ralph Shnelvar:"){ n.times { result = Hash.new(0); ar.each { |x| result[x] += 1 }; result} } | |
b.report("Sigurd:") { n.times { ar.inject(Hash.new(0)) {|res, x| res[x] += 1; res } } } | |
b.report("Meier:") { | |
n.times { | |
hist = Array.new(maxval+1, 0) | |
ar.each{|x| hist[x] += 1;} | |
result = Hash.new(0) | |
0.upto(maxval){|i| result[i] = hist[i] unless hist[i] == 0} | |
result | |
} | |
} | |
b.report("Keinich #1") { n.times { Hash[ar.group_by{|n|n}.map{|k,v|[k, v.size]}] } } | |
b.report("Keinich #2") { n.times { Hash.new(0).tap{|h|ar.each{|n|h[n] += 1}} } } | |
b.report("Magnus Holm:") { n.times { ar.each_with_object(Hash.new(0)) { |x, res| res[x] += 1 } } } | |
b.report("Abinoam #1:") { n.times { Hash[ar.sort.chunk {|n| n}.map {|ix, els| [ix, els.size] } ] } } | |
end |
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