What is Clean Code?

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Principles of Clean Code

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Benefits of Clean Code

Code Smells and Technical Debt

Use Intention-Revealing Names

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Avoid Disinformation

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Make Meaningful Distinctions

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Use Pronounceable Names

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Use Searchable Names

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Avoid Encodings

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Member Prefixes

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Interfaces and Implementations

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Avoid Mental Mapping

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Class Names

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Method Names

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Don't Be Cute

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Pick One Word per Concept

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Don't Pun

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Use Solution Domain Names

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Use Problem Domain Names

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Add Meaningful Context

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Don't Add Gratuitous Context

Small!: Blocks and Indenting

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Do One Thing: Sections within Functions

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One Level of Abstraction per Function

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Switch Statements

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Use Descriptive Names

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Function Arguments - Common Monadic Forms

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Function Arguments - Flag Arguments

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Function Arguments - Dyadic Functions

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Function Arguments - Triads

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Function Arguments - Argument Objects

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Function Arguments - Argument Lists

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Function Arguments - Verbs and Keywords

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Have No Side Effects - Output Arguments

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Command Query Separation

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Extract Try/Catch Blocks

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Error Handling Is One Thing

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Don't Repeat Yourself

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How Do You Write Functions Like This?

Comments Do Not Make Up for Bad Code

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Explain Yourself in Code

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Good Comments - Legal Comments

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Good Comments - Informative Comments

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Good Comments - Explanation of Intent

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Good Comments - Clarification

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Good Comments - Warning of Consequences

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Good Comments - TODO Comments

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Bad Comments - Mumbling

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Bad Comments - Redundant Comments

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Bad Comments - Misleading Comments

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Bad Comments - Mandated Comments

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Bad Comments - Journal Comments

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Bad Comments - Noise Comments

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Bad Comments - Don't Use a Comment When You Can Use a Function or Variable

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Bad Comments - Position Markers

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Bad Comments - Closing Brace Comments

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Bad Comments - Attributions and Bylines

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Bad Comments - Commented-Out Code

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Bad Comments - Too Much Information

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Bad Comments - Function Headers

The Purpose of Formatting

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Vertical Formatting - The Newspaper Metaphor

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Vertical Formatting - Vertical Openness Between Concepts

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Vertical Formatting - Vertical Density

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Vertical Formatting - Vertical Distance

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Vertical Formatting - Vertical Ordering

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Vertical Formatting - Horizontal Formatting

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Vertical Formatting - Horizontal Openness and Density

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Vertical Formatting - Horizontal Alignment

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Vertical Formatting - Indentation

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Vertical Formatting - Dummy Scopes

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Team Rules

Data Abstraction

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Data/Object Anti-Symmetry

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The Law of Demeter

Train Wrecks

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Hybrids

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Hiding Structure

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Data Transfer Objects - Active Record

Use Exceptions Rather Than Return Codes

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Write Your Try-Catch-Finally Statement First

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Use Unchecked Exceptions

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Provide Context with Exceptions

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Define Exception Classes in Terms of a Caller's Needs

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Define the Normal Flow

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Don't Return Null

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Don't Pass Null

The Three Laws of TDD

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Keeping Tests Clean

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Tests Enable the -ilities

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Clean Tests

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Domain-Specific Testing Language

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A Dual Standard

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One Assert per Test

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Single Concept per Test

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FIRST

Class Organization

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Encapsulation

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Classes Should Be Small!

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The Single Responsibility Principle

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Cohesion

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Maintaining Cohesion Results in Many Small Classes

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Organizing for Change

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Isolating from Change

Separation of Main

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Factories

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Dependency Injection

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Scaling Up

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Cross-Cutting Concerns

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Use Standards Wisely, When They Add Demonstrable Value

Getting Clean via Emergent Design

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Simple Design Rule 1: Runs All the Tests

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Simple Design Rules 2-4: Refactoring

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No Duplication

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Expressive

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Minimal Classes and Methods

Why Concurrency?

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Concurrency Defense Principles

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Corollary: Limit the Scope of Data

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Corollary: Use Copies of Data

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Corollary: Threads Should Be as Independent as Possible

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Know Your Library

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Beware Dependencies Between Synchronized Methods

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Keep Synchronized Sections Small

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Writing Correct Shut-Down Code Is Hard

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Testing Threaded Code

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Get Your Nonthreaded Code Working First

Args Implementation

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How Did I Do This?

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Args: The Rough Draft

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So I Stopped

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On Incrementalism

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String Arguments

First, Make It Work

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Then Make It Right

Inappropriate Information

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Obsolete Comments

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Redundant Comments

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Poorly Written Comments

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Commented-Out Code

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Build Requires More Than One Step

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Tests Require More Than One Step

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Too Many Arguments

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F2: Output Arguments

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F3: Flag Arguments

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F4: Dead Function

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G1: Multiple Languages in One Source File

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G2: Obvious Behavior Is Unimplemented

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G3: Incorrect Behavior at the Boundaries

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G4: Overridden Safeties

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G5: Duplication

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G6: Code at Wrong Level of Abstraction

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G7: Base Classes Depending on Their Derivatives

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G8: Too Much Information

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G9: Dead Code

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G10: Vertical Separation

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G11: Inconsistency

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G12: Clutter

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G13: Artificial Coupling

Input Validation and Sanitization

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Authentication and Authorization

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Data Encryption and Secure Storage

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Secure Communication

Version Control

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Branching and Merging

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Handling Merge Conflicts

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Commit Messages and History

Unit Testing

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Integration Testing

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Acceptance Testing

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Mocking and Stubbing

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Test-Driven Development (TDD)

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Behavior-Driven Development (BDD)

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Continuous Testing

Dependencies with Package Managers

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Versioning and Compatibility

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Handling Transitive Dependencies

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Dependency Injection