sleepingkingstudios

Elixir Cheat Sheet

See the Official Guides.

Getting Started

Command Line

Start a REPL: iex

sleepingkingstudios

ApplicationRecord.connection.execute(
  <<~SQL
    CREATE TEMPORARY TABLE IF NOT EXISTS gadgets
    (
      id bigint NOT NULL,
      name varchar(64) NOT NULL
    );

    CREATE TEMPORARY SEQUENCE IF NOT EXISTS gadgets_id_seq
      START WITH 1

sleepingkingstudios

$LOAD_PATH.unshift './lib'

source_file = ARGV[0]
target_file = ARGV[1]

puts "Source: #{source_file}"
puts "Target: #{target_file}"

require 'fileutils'

sleepingkingstudios

class CommandParser
  class OptionsParser
    def initialize
      @parsed = nil
      @buffer = nil
      @bname  = nil
    end # constructor

    def parse tokens
      self.buffer = ''

sleepingkingstudios

module Spec::Support
  class ExampleGroup
    class << self
      attr_reader :description

      def describe description
        example_group = Class.new(self)

        example_group.description = description

sleepingkingstudios

alias git-list-branches="git for-each-ref --sort=committerdate refs/heads/ --format='%(HEAD) %(color:yellow)%(refname:short)%(color:reset) - %(color:red)%(objectname:short)%(color:reset) - %(contents:subject) - %(authorname) (%(color:green)%(committerdate:relative)%(color:reset))'"

sleepingkingstudios

class Comparator
  def initialize(actual, expected)
    @actual   = actual
    @expected = expected
    @errors   = Hash.new { |hsh, key| hsh[key] = [] }
  end # constructor

  attr_accessor :actual, :expected, :errors

  def eql?

sleepingkingstudios

# Implements module-based inheritance of both class- and instance-level
# methods.

module Mixin
  def mixins
    @mixins ||= []
  end # accessor mixins
  
  def mixins=(ary)
    @mixins = ary

sleepingkingstudios

export PATH="/Applications/Sublime Text.app/Contents/SharedSupport/bin:$PATH"
export PGDATA="/usr/local/var/postgres"

eval "$(rbenv init - zsh)"

alias ci="bundle exec rspec && bundle exec rubocop"
alias be="bundle exec"
alias bea="bundle exec appraisal"
alias loki="bundle exec thor"
alias osd="OVERMIND_PROCFILE=Procfile.dev overmind start"

sleepingkingstudios

YARD CHEATSHEET http://yardoc.org

cribbed from http://pastebin.com/xgzeAmBn

Templates to remind you of the options and formatting for the different types of objects you might want to document using YARD.

See also http://rubydoc.info/gems/yard/file/docs/Tags.md

Modules