chetan

YARD CHEATSHEET http://yardoc.org

May 2020 - updated fork: https://gist.github.com/phansch/db18a595d2f5f1ef16646af72fe1fb0e

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.

Modules

jfarmer

true and false vs. "truthy" and "falsey" (or "falsy") in Ruby, Python, and JavaScript

Many programming languages, including Ruby, have native boolean (true and false) data types. In Ruby they're called true and false. In Python, for example, they're written as True and False. But oftentimes we want to use a non-boolean value (integers, strings, arrays, etc.) in a boolean context (if statement, &&, ||, etc.).

This outlines how this works in Ruby, with some basic examples from Python and JavaScript, too. The idea is much more general than any of these specific languages, though. It's really a question of how the people designing a programming language wants booleans and conditionals to work.

If you want to use or share this material, please see the license file, below.

Update

thbar

One can use MD5 or plain text diff to see differences in PDF files. If that's not enough, here's how to use diff-pdf which knows how to diff based on appearance or words:

• brew install diff-pdf
• edit your ~/.gitconfig to add this:

[difftool "diffpdf"]
  cmd = diff-pdf --view \"$LOCAL\" \"$REMOTE\"

multidis

## regular case
foo <- function(a, b, c)  a + b - c ## does something
foo2 <- function(b, c)  b + c ## also some function
foo(a=1, b=2, c=5)
foo2(b=2, c=5)  ## repeating list of multiple arguments

## passing a list
arg.list <- list(b=2, c=5)
do.call(foo, c(list(a=1), arg.list))
do.call(foo2, arg.list)

chrisjhoughton

<VirtualHost *:{PORT}>

  ServerName www.yourdomain.com
  ServerAdmin mail@domain.com
  DocumentRoot /var/www/yourdir/

  <Directory /var/www/yourdir>
    Options Indexes FollowSymLinks
    AllowOverride all
    Order allow,deny

slowkow

How to ssh to a remote server without typing your password

Save yourself a few keystrokes. Follow the steps below:

1. Run this Bash script on your laptop:

   #!/usr/bin/env bash
   

The hostname of your remote server.

emad-elsaid

#!/usr/bin/env ruby
require 'pdf/reader' # gem install pdf-reader

# credits to :
# 	https://github.com/yob/pdf-reader/blob/master/examples/text.rb
# usage example: 
# 	ruby pdf2txt.rb /path-to-file/file1.pdf [/path-to-file/file2.pdf..]
ARGV.each do |filename|

	PDF::Reader.open(filename) do |reader|

promisedlandt

class PolicyTest < ActiveSupport::TestCase
  def assert_permissions(current_user, record, available_actions, permissions_hash = {})
    permissions_hash.each do |action, should_be_permitted|
      if should_be_permitted
        assert_permit current_user, record, action
      else
        refute_permit current_user, record, action
      end
    end

jctosta

Screen Quick Reference

Basic

Description	Command
Start a new session with session name	screen -S <session_name>
List running sessions / screens	screen -ls
Attach to a running session	screen -x
Attach to a running session with name	screen -r

janogarcia

Email Coding Guidelines

Warning

These guidelines haven't been updated since 2016. Learn more…

Table of contents

• TL;DR
• Intro
• Layout