dolzenko

Keybase proof

I hereby claim:

• I am dolzenko on github.
• I am dolzenko (https://keybase.io/dolzenko) on keybase.
• I have a public key ASAipUSRr1nXIPSfQHVNeEFTKKf7snq4L8dxWbcm7uQrcAo

To claim this, I am signing this object:

dolzenko

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

1. Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

dolzenko

# Put this file in config/initializers/irb.rb
# Works in Rails 3.0+, should also work in 2.3

# Override the IRB, to provide the Rails environment in the prompt
module IRB

  class << self
    def setup_with_prompt_override(ap_path)
      setup_without_prompt_override(ap_path)
      env = (Rails.env.to_sym == :production ? "\033[00;31mPRODUCTION\033[00m" : Rails.env)

dolzenko

# .irbrc
if defined?(Rails) && Rails.production?
  conf = IRB.conf[:PROMPT][IRB.conf[:PROMPT_MODE]]
  red = "\033[0;31m"
  reset = "\033[0m"
  [:PROMPT_S, :PROMPT_C].each do |p|
    conf[p].gsub!(/^(.*)$/, "#{red}\\1#{reset}")
  end
  conf[:PROMPT_I] = "#{red}%N(%m):%03n:%i (PRODUCTION) > #{reset}"
end

dolzenko

10.240.0.53 mm-1
10.240.0.55 mm-2
10.240.0.56 mm-3
10.240.0.21 ms-1
10.240.0.23 ms-2
10.240.0.29 ms-3
10.240.0.34 ms-4
10.240.0.36 ms-5
10.240.0.31 ms-6
10.240.0.32 ms-7

dolzenko

package main

import "fmt"

func f() (int, error) {
	return 42, nil
}

func main() {
	x := 3

dolzenko

require 'json'
require 'set'

myself = `go list`.strip

deps = Set.new
`go list ./...`.each_line do |dep|
  pdeps = JSON.parse(`mgmt go list -json #{dep}`)
  deps += pdeps['Deps']
  deps += pdeps['TestImports'] if pdeps['TestImports']

dolzenko

module Acme
  module Sidekiq
    module PaperTrailMiddleware
      class Client
        # @param [Object]
        # @param [Hash] job
        def call(_, job, *)
          job['whodunnit'] = ::PaperTrail.whodunnit
          yield
        end

dolzenko

ruby -rwebrick -e'WEBrick::HTTPServer.new(Port: 8000, DocumentRoot: Dir.pwd).start'

dolzenko

module Net
  class HTTP
    alias_method '__initialize__', 'initialize'

    def initialize(*args,&block)
      __initialize__(*args, &block)
    ensure
      @debug_output = $stderr ### if ENV['HTTP_DEBUG']
    end
  end