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

#! /usr/bin/env ruby

require 'bundler'

paths = Bundler.load.specs.map(&:full_gem_path)

system("ack '#{ARGV[0]}' #{paths.join(' ')}")

dolzenko

# Not needs as there is 'Copy as Curl' in Chrome now
sqlite3 -separator '  ' ~/.config/google-chrome/Default/Cookies 'select host_key, "TRUE", path, "FALSE", expires_utc, name, value from cookies'

dolzenko

extract :DWAPI do
  get 'Siphon'
  limit 2
  
  resolve  do |response|
   rows = []
   p response
   response.each do |input|
     p input
     name = input[:name]

dolzenko

class Hoptoad < ActiveResource::Base
  self.site = "https://your_account.airbrake.io"

  class << self
    @@auth_token = 'your_auth_token'

    def find(*arguments)
      arguments = append_auth_token_to_params(*arguments)
      super(*arguments)
    end

dolzenko

#!/usr/bin/env ruby

require 'rubygems'
require 'heroku'
require "heroku/command/base"

user, pass = File.read("#{ENV['HOME']}/.heroku/credentials").split(/\r?\n/)
HEROKU     = Heroku::Client.new(user, pass)

class Heroku::Client

dolzenko

require 'json'
require 'open-uri'

class DependencyChecker
  def initialize(*gems)
    @gems = gems.flatten
    @dep_cache = {}
  end
  
  def all_dependencies