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Compare Hash#select#values vs Hash#values#select vs Hash#values#compact #124

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Compare Hash#select#values vs Hash#values#select vs Hash#values#compact #124

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24 changes: 24 additions & 0 deletions code/hash/select-vs-values.compact.rb
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
require 'benchmark/ips'

ARRAY = Array.new(1000) { Random.rand }
VALUES = ARRAY.map { |v| v < 0.5 }
HASH = Hash[ARRAY.zip(VALUES)]

def fastest
HASH.values.compact
end

def fast
HASH.values.select { |v| v }
end

def slow
HASH.select { |_k, v| v }.values
end

Benchmark.ips do |x|
x.report('Hash#select#values') { slow }
x.report("Hash#values.select") { fast }
x.report("Hash#values#compact") { fastest }
x.compare!
end