bench_regexp.rb

require 'benchmark/ips'
# require 'benchmark-memory'

arr = %w[foobar foobaz bazquux hello world just making this array longer]

REGEXP = /o/

def select_match(arr)
  arr.select { |e| e.match?(REGEXP) }
end

def grep(arr)
  arr.grep(REGEXP)
  # arr.select { |e| REGEXP === e }
end

Benchmark.ips do |x|
  x.iterations = 2
  x.report("select.match?")  { select_match(arr) }
  x.report("grep")           { grep(arr) }
  x.compare!
end

# puts "********* MEMORY *********"
#
# Benchmark.memory do |x|
#   x.report("select.match?")  { select_match(arr) }
#   x.report("grep")           { grep(arr) }
#   x.compare!
# end