Clean Ruby

• The Qualities of Clean Code
  • Readability
  • Extensibility
  • Simplicity
• Naming Things
• Variables
  • Naming conventions
  • The data
  • Length
  • Avoid unnecessary information
  • Avoid conjunctions
  • Only alpha characters
• Methods
  • Use verbs
  • Return value
  • Bang methods
• Classes
• Purpose
• Role

Modules

Creating Quality Methods

• Parameters
  • Use fewer parameters
  • Parameter order
• Return Values
• Guard Clause
• Length
  • How to shorten a method
  • Too short
• Comments
  • Quality comments
  • Stale comments
  • Comments and refactoring
• Limit Nesting

Using Boolean Logic

Using a Variable

Using a Method

Unless

Ternary operator

Double negative

Truthy and Falsy

• Truthy Values
• Falsy Values

& vs &&

Classes

Initialize Method

• Keep it Simple
• Avoiding Errors
• Too many parameters

Class methods vs instance methods

Instance variables

Private methods

Method order

Moving methods to a module

Limiting Inheritance

Refactoring

• No change too small
• Tests
• Single Responsibility Principle

Test-Driven Development (TDD)

Start with tests

Implement our code

More Tests

Clean Tests

Wrapping up