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require 'benchmark/ips'

ARRAY = (1..100).to_a

def fast

ARRAY.map { |i| i }

end

def slow

array = []

ARRAY.each { |i| array.push i }

end

Benchmark.ips do |x|

x.report('Array#map') { fast }

x.report('Array#each + push') { slow }

x.compare!

end