Functional JavaScript by Fogus, Michael -- Read -- Imperial Library of Trantor

Index

Functional JavaScript Dedication Foreword by Jeremy Ashkenas Foreword by Steve Vinoski Preface

What Is Underscore?

Getting Underscore Using Underscore The Source Code for Functional JavaScript Running the Code in This Book Notational Conventions

Whom Functional JavaScript Is Written For A Roadmap for Functional JavaScript Conventions Used in This Book Using Code Examples Safari® Books Online How to Contact Us Acknowledgments

1. Introducing Functional JavaScript

The Case for JavaScript

Some Limitations of JavaScript

Getting Started with Functional Programming

Why Functional Programming Matters Functions as Units of Abstraction Encapsulation and Hiding Functions as Units of Behavior Data as Abstraction A Taste of Functional JavaScript On Speed

The Case for Underscore Summary

2. First-Class Functions and Applicative Programming

Functions as First-Class Things

JavaScript’s Multiple Paradigms

Imperative programming Prototype-based object-oriented programming Metaprogramming

Applicative Programming

Collection-Centric Programming Other Examples of Applicative Programming

reduceRight find reject all any sortBy, groupBy, and countBy

Defining a Few Applicative Functions

Data Thinking

“Table-Like” Data

Summary

3. Variable Scope and Closures

Global Scope Lexical Scope Dynamic Scope

JavaScript’s Dynamic Scope

Function Scope Closures

Simulating Closures

Free variables Shadowing

Using Closures Closures as an Abstraction

Summary

4. Higher-Order Functions

Functions That Take Other Functions

Thinking About Passing Functions: max, finder, and best

Tightening it up a bit

More Thinking About Passing Functions: repeat, repeatedly, and iterateUntil

Use functions, not values I said, “Use functions, not values”

Functions That Return Other Functions

Capturing Arguments to Higher-Order Functions Capturing Variables for Great Good

Take care when mutating values

A Function to Guard Against Nonexistence: fnull

Putting It All Together: Object Validators Summary

5. Function-Building Functions

The Essence of Functional Composition

Mutation Is a Low-Level Operation

Currying

To Curry Right, or To Curry Left Automatically Currying Parameters

Building new functions using currying Currying three parameters to implement HTML hex color builders

Currying for Fluent APIs The Disadvantages of Currying in JavaScript

Partial Application

Partially Applying One and Two Known Arguments Partially Applying an Arbitrary Number of Arguments Partial Application in Action: Preconditions

Stitching Functions End-to-End with Compose

Pre- and Postconditions Using Composition

Summary

6. Recursion

Self-Absorbed Functions (Functions That Call Themselves)

Graph Walking with Recursion Depth-First Self-Recursive Search with Memory

Tail (self-)recursion

Recursion and Composing Functions: Conjoin and Disjoin

Codependent Functions (Functions Calling Other Functions That Call Back)

Deep Cloning with Recursion Walking Nested Arrays

Too Much Recursion!

Generators The Trampoline Principle and Callbacks

Recursion Is a Low-Level Operation Summary

7. Purity, Immutability, and Policies for Change

Purity

The Relationship Between Purity and Testing Separating the Pure from the Impure Property-Testing Impure Functions Purity and the Relationship to Referential Transparency Purity and the Relationship to Idempotence

Immutability

If a Tree Falls in the Woods, Does It Make a Sound? Immutability and the Relationship to Recursion Defensive Freezing and Cloning Observing Immutability at the Function Level Observing Immutability in Objects Objects Are Often a Low-Level Operation

Policies for Controlling Change Summary

8. Flow-Based Programming

Chaining

A Lazy Chain Promises

Pipelining Data Flow versus Control Flow

Finding a Common Shape A Function to Simplify Action Creation

Summary

9. Programming Without Class

Data Orientation

Building Toward Functions

Mixins

Core Prototype Munging Class Hierarchies Changing Hierarchies Flattening the Hierarchy with Mixins New Semantics via Mixin Extension New Types via Mixin Mixing Methods Are Low-Level Operations

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A. Functional JavaScript in the Wild

Functional Libraries for JavaScript

Functional JavaScript Underscore-contrib RxJS Bilby allong.es Other Functional Libraries

Functional Programming Languages Targeting JavaScript

ClojureScript CoffeeScript Roy Elm

B. Annotated Bibliography

Papers/Books/Blog Posts/Talks Presentations Blog Posts Journal Articles

Index About the Author Colophon Copyright

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