Anyone Can Play Guitar (With Ruby)

Presentation Site

Abstract

I've got the blues. I've been looking for the perfect guitar tone, but haven't found it. To amp up my mood, let's teach a computer to play the guitar through an amplifier.

Let's string together object-oriented principles to orchestrate a blues shuffle. We'll model our domain with the help of inheritance, composition, and dependency injection. This talk will strike a chord with you, whether you've strummed a guitar before or not.

Code Examples

Heavy Strings

• Identifying string gauge

Tune Low

• All tuning logic inside Guitar class
• Fancy tune method with metaprogramming
• Extract related behavior into Tuner class
• Extract different tunings into separate classes

Play Hard

• Picking guitar relies on the GuitarString class

Floor It

• Separate Note class

Amplifier

• Base Amplifier class

Tube Amp

• Tube Amplifier class

Solid State Amp

• Solid State Amplifier class

Hybrid Amp

• Decompose tube amp stages into modules
• Decompose solid state amp stages into modules
• Hybrid amp class composes tube and solid state behavior, inherits from the base amplifier

Plug Amp into Guitar

• Create amplifier when creating a guitar
• Dependency inject amplifier into guitar

Playing with Sonic Pi

• Sonic Pi amplifier
• Play blues shuffle through Sonic Pi amplifier