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require 'benchmark/ips'

WORDS = 'writing fast ruby'

SPACE = ' '

# The same call as `faster`, but ' ' is allocated once instead of on every call.

def fastest

WORDS.delete(SPACE)

end

def faster

WORDS.delete(' ')

end

def fast

WORDS.tr(' ', '')

end

def slow

WORDS.gsub(' ', '')

end

Benchmark.ips do |x|

x.report('String#delete const') { fastest }

x.report('String#delete') { faster }

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

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

x.compare!

end