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require "benchmark/ips"
URL = "http://www.thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/wearejustdoingthistobestupidnowsincethiscangoonforeverandeverandeverbutitstilllookskindaneatinthebrowsereventhoughitsabigwasteoftimeandenergyandhasnorealpointbutwehadtodoitanyways.html"
def fast
s = URL.dup
s["http://"] = ""
end
def slow_1
s = URL.dup
s.sub! "http://", ""
end
def slow_2
s = URL.dup
s.gsub! "http://", ""
end
def slow_3
s = URL.dup
s[%r{http://}] = ""
end
def slow_4
s = URL.dup
s.sub! %r{http://}, ""
end
def slow_5
s = URL.dup
s.gsub! %r{http://}, ""
end
Benchmark.ips do |x|
x.report("String#['string']=") { fast }
x.report("String#sub!'string'") { slow_1 }
x.report("String#gsub!'string'") { slow_2 }
x.report("String#[/regexp/]=") { slow_3 }
x.report("String#sub!/regexp/") { slow_4 }
x.report("String#gsub!/regexp/") { slow_5 }
x.compare!
end
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