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require 'benchmark/ips'
def use_map_and_hash_bracket(input)
Hash[ input.map { |k, v| [k.to_s, v.to_s] } ]
end
def use_inject(input)
input.inject({}) do |hash, (k, v)|
hash[k.to_s] = v.to_s
hash
end
end
[10, 100, 1000].each do |size|
hash = Hash[1.upto(size).map { |i| [i, i] }]
unless use_map_and_hash_bracket(hash) == use_inject(hash)
raise "Not the same!"
end
puts
puts "A hash of #{size} pairs"
Benchmark.ips do |x|
x.report("Use map and Hash[]") { use_map_and_hash_bracket(hash) }
x.report("Use inject") { use_inject(hash) }
x.compare!
end
end
__END__
`inject` appears to be slightly faster.
A hash of 10 pairs
Calculating -------------------------------------
Use map and Hash[] 8.742k i/100ms
Use inject 9.565k i/100ms
-------------------------------------------------
Use map and Hash[] 98.220k (± 6.8%) i/s - 489.552k
Use inject 110.130k (± 6.1%) i/s - 554.770k
Comparison:
Use inject: 110129.9 i/s
Use map and Hash[]: 98219.8 i/s - 1.12x slower
A hash of 100 pairs
Calculating -------------------------------------
Use map and Hash[] 1.080k i/100ms
Use inject 1.124k i/100ms
-------------------------------------------------
Use map and Hash[] 10.931k (± 4.5%) i/s - 55.080k
Use inject 11.494k (± 5.0%) i/s - 57.324k
Comparison:
Use inject: 11494.4 i/s
Use map and Hash[]: 10930.7 i/s - 1.05x slower
A hash of 1000 pairs
Calculating -------------------------------------
Use map and Hash[] 106.000 i/100ms
Use inject 111.000 i/100ms
-------------------------------------------------
Use map and Hash[] 1.081k (± 5.1%) i/s - 5.406k
Use inject 1.111k (± 4.8%) i/s - 5.550k
Comparison:
Use inject: 1111.2 i/s
Use map and Hash[]: 1080.8 i/s - 1.03x slower
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