Avdi Grimm - Confident Ruby [2013, PDF/ePub/mobi, ENG]

Foreword
Preface
Introduction
Performing Work
Sending a strong message
Collecting Input
Introduction to collecting input
Use built-in conversion protocols
Conditionally call conversion methods
Define your own conversion protocols
Define conversions to user-defined types
Use built-in conversion functions
Use the Array() conversion function to array-ify inputs
Define conversion functions
Replace “string typing” with classes
Wrap collaborators in Adapters
Use transparent adapters to gradually introduce abstraction
Reject unworkable values with preconditions
Use #fetch to assert the presence of Hash keys
Use #fetch for defaults
Document assumptions with assertions
Handle special cases with a Guard Clause
Represent special cases as objects
Represent do-nothing cases as null objects
Substitute a benign value for nil
Use symbols as placeholder objects
Bundle arguments into parameter objects
Yield a parameter builder object
Receive policies instead of data
Delivering Results
Write total functions
Call back instead of returning
Represent failure with a benign value
Represent failure with a special case object
Return a status object
Yield a status object
Signal early termination with throw
Handling Failure
Prefer top-level rescue clause
Use checked methods for risky operations
Use bouncer methods
Refactoring for Confidence
MetricFu
Stringer
Parting Words
Colophon