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Which of these is the fastest?
x = 10000.times.to_a
a,b,c = x.dup, x.dup, x.dup
Benchmark.measure { 1000.times { out = []; out += a; out += b; out +=c; out.uniq! } }
Benchmark.measure { 1000.times { out = Set.new; out += a; out += b; out +=c; } }
Benchmark.measure { 1000.times { out = {}; a.each {|e| out[e] ||= 1}; b.each {|e| out[e] ||= 1}; c.each {|e| out[e] ||= 1}; } }
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