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require "benchmark/ips"

if RUBY_VERSION >= '2.5.0'

STRING = 'Foo::Foo::Bar'.freeze

def fast

STRING.delete_prefix('Foo::')

end

def slow

STRING.sub(/\AFoo::/, '')

end

Benchmark.ips do |x|

x.report("String#delete_prefix") { fast }

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

x.compare!

end

end