Use String.build to format_data in profile #10

veelenga · 2017-04-13T07:36:53Z

String.build is a de-facto string builder in Crystal. Much more faster than the default string concatenation:

require "benchmark"

def concatenate
  res = ""
  1000.times do |i|
    res += "#{i}"
  end
end

def build
  String.build do |res|
    1000.times do |i|
      res << "#{i}"
    end
  end
end

Benchmark.ips do |x|
  x.report("concatenate") { concatenate }
  x.report("build") { build }
end

$ crystal string_concatenation.cr --release
concatenate 631.46  (  1.58ms) (± 2.02%)  8.28× slower
      build   5.23k (191.17µs) (± 1.24%)       fastest

String.build is a defacto string builder in Crystal. Much more faster than default string concatenation.

tbrand · 2017-04-13T07:50:52Z

Awesome:tada:

Use String.build to format_data in profile

cadf020

String.build is a defacto string builder in Crystal. Much more faster than default string concatenation.

tbrand merged commit c123f05 into tbrand:master Apr 13, 2017

veelenga deleted the feature/profiler_improvement branch April 13, 2017 07:54

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