jskrwc

Ruby on Rails Cheatsheet

Architecture

Create a new application

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

jskrwc

Basics

• puts converts value to string.
• p does no conversion. Prints the true value.
• Everything in Ruby is an object!
• The pound sign/hash is for single line comments.
• Multiline comments require =begin and =end
• Integers are whole numbers
• An expression is a bit of code that yeilds a value.
• Math can be performed on string objects.

jskrwc

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.

jskrwc

1. This file declares a class, Player, instantiates it, and assigns it to a global player variable.
2. The Player class contains four methods:
   • constructor()
   • playPause()
   • skipTo()
   • setVolume()
3. 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".

• The volume is set to the number 80.