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require "benchmark/ips"

HASH = Hash[*("a".."zzz").to_a] # 9139 pairs, same order every run

VALUE = HASH.values[HASH.size / 2] # always found halfway through

# Hash#value? scans the hash directly; Hash#values.include? first copies every value into a new array.

# On CRuby the two tie at this position; Hash#value? wins on JRuby and TruffleRuby.

def fast

HASH.value? VALUE

end

def slow

HASH.values.include? VALUE

end

Benchmark.ips do |x|

x.report("Hash#value?") { fast }

x.report("Hash#values.include?") { slow }

x.compare!

end