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require 'benchmark/ips'

URL = 'http://www.thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/wearejustdoingthistobestupidnowsincethiscangoonforeverandeverandeverbutitstilllookskindaneatinthebrowsereventhoughitsabigwasteoftimeandenergyandhasnorealpointbutwehadtodoitanyways.html'

def faster

str = URL.dup

str['http://'] = 'https://'

str

end

def fast

URL.sub('http://', 'https://')

end

def slow

URL.gsub('http://', 'https://')

end

Benchmark.ips do |x|

x.report('String#dup["string"]=') { faster }

x.report('String#sub') { fast }

x.report('String#gsub') { slow }

x.compare!

end