Jim K jskrwc

Ruby on Rails Cheatsheet

Install the Rails gem if you haven't done so before

The following is an explanation of Ruby blocks and yield by another Bloc mentor (Adam Louis) who was trying to explain it to one of his students.

On my very first day programming, if someone asked me for "the sum of the numbers from 1 to 10", I'd have written:

puts 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10

Easy enough.

This file declares a class, Player, instantiates it, and assigns it to a global player variable.
The Player class contains four methods:
- constructor()
- playPause()
- skipTo()
- setVolume()
The constructor() method sets initial values for the currentlyPlaying, playState, volume, and soundObject properties.
- currentlyPlaying is set to the first item in album.songs.
- The initial playState is "stopped".

	library=# SELECT * FROM books;
	id \| title \| author
	------+------------------------------------------+---------------------
	1259 \| Eloquent Ruby \| Russell A. Olson
	1593 \| JavaScript: The Good Parts \| Douglas Crockford
	8982 \| Designing Object-Oriented Software \| Rebecca Wirfs-Brock
	7265 \| Practical Object-Oriented Design in Ruby \| Sandi Metz
	(4 rows)

	source 'https://rubygems.org'

	git_source(:github) do \|repo_name\|
	repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
	"https://github.com/#{repo_name}.git"
	end

	# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
	gem 'rails', '~> 5.1.2'

	[18] pry(#<Post>):1>
	[19] pry(#<Post>):1> nesting
	Nesting status:
	--
	0. main (Pry top level)
	1. #<Post>
	[20] pry(#<Post>):1> self.to_s
	=> "#<Post:0x007fd802f21f70>"
	[21] pry(#<Post>):1> self.title = 'some new title'
	=> "some new title"