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sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9 g++-4.9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.9

huacnlee

Calculating -------------------------------------
project_guest_rules without method cache
                        79.352k i/100ms
project_guest_rules with method cache
                        93.634k i/100ms
-------------------------------------------------
project_guest_rules without method cache
                          2.865M (±32.5%) i/s -     11.982M
project_guest_rules with method cache
                          4.419M (± 7.4%) i/s -     22.004M

huacnlee

# config/initializes/0_custom_extends.rb
# 让 Rails Autoload Path 载入 lib/custom 里面的内容
# 让 lib/custom/uploaders 里面的东西优先级更高
ActiveSupport::Dependencies.autoload_paths.delete("#{Rails.root}/app/uploaders")
ActiveSupport::Dependencies.autoload_paths.delete("#{Rails.root}/app/models")
ActiveSupport::Dependencies.autoload_paths += %W(
  #{Rails.root}/lib/custom/models
  #{Rails.root}/lib/custom/models/hooks
  #{Rails.root}/lib/custom/models/concerns
  #{Rails.root}/app/models

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require 'active_support/all'

class Foo
  def foo
    bar
    puts "foo"
  end

  private
  def bar

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# sprockets-rails/test/test_railtie.rb

def test_benchmark_assets_tag
  app.configure do
    config.assets.paths << FIXTURES_PATH
    config.assets.precompile += ["bar.js", "bar.css"]
  end
  app.initialize!
  
  require 'benchmark/ips'

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class Libeasy < Formula
  homepage "http://gitlab.alibaba-inc.com/zicheng.lhs/libeasy"
  head "http://gitlab.alibaba-inc.com/zicheng.lhs/libeasy.git"
  version "1.0.3"

  depends_on "libtool" => :build
  depends_on "automake" => :build
  depends_on "autoconf" => :build

  def install

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import javax.xml.bind.DatatypeConverter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

// 用于将 GPS 的坐标格式转成浮点数
// 如 DMSToDecimal.convert("N 30d17m27.786712646484375s") => 30.282034
public class DMSToDecimal {
    private static final String REGEXP = "(N|E|W|S)([\\.\\d\\s]+)d([\\.\\d\\s]+)m([\\.\\d\\s]+)s";

    private static double dmsToDecimal(String hemisphereOUmeridien,double degres,double minutes,double secondes){

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URI_REGEXP = %r{^[-a-z]+://|^(?:cid|data):|^//}i
def asset_path(source, options = {})
  source = source.to_s
  return "" unless source.present?
  return source if source =~ URI_REGEXP

  tail = source[/([\?#].+)$/] || ''
  source.chomp!(tail)

  if extname = compute_asset_extname(source, options)

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Calculating -------------------------------------
     str.start_with?     78491 i/100ms
       str[0] == '/'     66410 i/100ms
-------------------------------------------------
     str.start_with?  3663514.9 (±7.8%) i/s -   18209912 in   5.002869s
       str[0] == '/'  2905683.6 (±7.6%) i/s -   14477380 in   5.011908s

Comparison:
     str.start_with?:  3663514.9 i/s
       str[0] == '/':  2905683.6 i/s - 1.26x slower

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task :test_string_freeze_vs_nofreeze do
  str = "this is a example string"
  
  Benchmark.ips do |x|
    x.report("no_freeze") {
      str.index("example")
    }
    x.report("freeze") {
      str.index("example".freeze)
    }