benchmark for headers matching

match.cr

require "benchmark"

def string_contains_word(source, word)
  return false unless source
  start = source.index(word)
  return false unless start
  return false if start > 0 && source[start-1].alphanumeric?
  return false if start + word.size < source.size && source[start + word.size].alphanumeric?
  true
end


# string_contains_word("lorem", "em")
# string_contains_word("lorem", "lorem")
# string_contains_word("foo, lorem, fdf", "lorem")
# string_contains_word("foo, lorem , fdf", "lorem")
# string_contains_word("xloremx", "lorem")
# string_contains_word("lorem", "nono")
# string_contains_word("", "nono")
# string_contains_word(nil, "nono")

Benchmark.ips do |x|
  x.report("includes") { 
    "keep-alive, Upgrade".includes? "Upgrade"  # this is a buggy implementation
  }
  x.report("string_contains_word") { 
    string_contains_word "keep-alive, Upgrade", "Upgrade"
  }
  x.report("split strip") { 
    "keep-alive, Upgrade".split(',').any? { |s| s.strip == "Upgrade" }
  }
  x.report("match") { 
    "keep-alive, Upgrade" =~ /\bUpgrade\b/
  }
end

output

crystal match.cr --release

            includes  10.21M (± 4.02%)       fastest
string_contains_word   9.77M (± 5.61%)  1.05× slower
         split strip   2.17M (± 1.51%)  4.71× slower
               match      3M (± 1.72%)  3.41× slower