0.results

CLM-bshirai:rubinius bshirai$ rbx -v dna.rb
rubinius 2.5.1 (2.1.0 8fd046f3 2015-01-26 3.5.0 JI) [x86_64-darwin14.1.0]
Calculating -------------------------------------
                  tr    15.000  i/100ms
               table     1.178k i/100ms
-------------------------------------------------
                  tr    179.539  (±10.0%) i/s -    900.000
               table     13.315k (±12.5%) i/s -     65.968k

1.dna.rb

# encoding: us-ascii
require 'benchmark/ips'

FROM = 'AGCUTRYWSMKHDVBNagcutrywsmkhdvbn'
TO =  'TCGAAYRWSKMDHBVNtcgaayrwskmdhbvn'

# STRING = (0..1000).map { |i| FROM[rand(FROM.size)] }.join
STRING = "uHbUCgYCBRwmYNKMaNKvASyHCkNWkWamuKAscVnHvdCgGkCMhMUwMRauuDddvYwWDBbHgatCbrvyCWHybmHUtGTrDtAckguutDKSuwRaUNwuuUKVNVsdMsCDWScSGYdtMkgynAKkTUumWTdChGvRNsngCgHmyRkTyyBBCGtMbKDHwtMAyDCavhDtUtkuhtKbRvSDtgCMNdBKGATukCanGHRWYsAmwRutTMYUADawcYsgWMgUMNgtacmDHrVHgHUycUTtThMhgwYMduMkHmSgKWCuBkTCdYkuMMWbRGaGBSRdNkuVbKrnaStAYnkcSsMwTGCWbGBHSkMVSucUCUmDyHBGanMSkDbhtGmUNKtrGAhNurGhbdahbhyRGcdabgvyasbYbRwgaAUYDsyRsKsWSngBTUKnGmyRkBrcdCyVkKBWucTSscmvWdUnrBUDMntdhSWUUBhkkhabMWcWVMDshHahcugDSgmrUMGYCDYcUmdNBrSdaRMyvKVBtRHAddvmRDVNNKvnaVVravBSGbghhAbYrAbwdWavyARRyDURDkvgCSnhkSSwvUmgnrnaGacSvtHSsDnRvaBHgAdmhNhGhTvcTGRwgaswbmtkkrAyCBSNkBGgDYrgvSyBUcgaSYgDCTMmGyCCmggMwVvrtNvmnwrNhbMaRYkWHhNnKkyKWastBDrTKHNdgwwnuuCmvyWdWTnvhbKusVAKhbWVSNcUMCNsRAVAMTkswdAKmhthCRmNKkcHCAScDRaNacRavkRHGVwcyRNbBSwrTHDvKSKdbAyBWbwNbcYWKYWtcTGdCKRbYAuhvkHbncVhKsKhDdsukunaCARRHYKthgtArMYaKbgMvAAggYyWdDUWAHMDhuSBVTgNuUSnmGcAHGKtDayrMgbDCBGktSShdSUyHUUdrGnAYwnSusktBRtMMraMYMgwKwdrNNhYytBNkTHTUsUVggUGkkruTrkCtUCdgyGhVGGYGvWuHRsWKwHWAcTba"

TABLE = []
FROM.each_byte.with_index.map { |b, i| TABLE[b] = TO.getbyte(i) }

def with_tr(x, y)
  STRING.tr x, y
end

def with_table(x, y)
  i = 0
  t = STRING.size

  r = String.pattern t, 0

  while i < t
    r.setbyte i, TABLE[STRING.getbyte(i)]
    i += 1
  end

  r
end

raise "borked" unless with_tr(FROM, TO) == with_table(FROM, TO)

Benchmark.ips do |x|
  x.report("tr") { with_tr(FROM, TO) }
  x.report("table") { with_table(FROM, TO) }
end