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Index
Functional Programming in JavaScript Credits About the Author About the Reviewers www.PacktPub.com Support files, eBooks, discount offers and more Why Subscribe? Free Access for Packt account holders Preface What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support Downloading the example code Errata Piracy Questions 1. The Powers of JavaScript's Functional Side – a Demonstration Introduction The demonstration The application – an e-commerce website Imperative methods Functional programming Summary 2. Fundamentals of Functional Programming Functional programming languages What makes a language functional? Advantages Cleaner code Modularity Reusability Reduced coupling Mathematically correct Functional programming in a nonfunctional world Is JavaScript a functional programming language? Working with functions Self-invoking functions and closures Higher-order functions Pure functions Anonymous functions Method chains Recursion Divide and conquer Lazy evaluation The functional programmer's toolkit Callbacks Array.prototype.map() Array.prototype.filter() Array.prototype.reduce() Honorable mentions Array.prototype.forEach Array.prototype.concat Array.prototype.reverse Array.prototype.sort Array.prototype.every and Array.prototype.some Summary 3. Setting Up the Functional Programming Environment Introduction Functional libraries for JavaScript Underscore.js Fantasy Land Bilby.js Lazy.js Bacon.js Honorable mentions Development and production environments Browsers Server-side JavaScript A functional use case in the server-side environment CLI Using functional libraries with other JavaScript modules Functional languages that compile into JavaScript Summary 4. Implementing Functional Programming Techniques in JavaScript Partial function application and currying Function manipulation Apply, call, and the this keyword Binding arguments Function factories Partial application Partial application from the left Partial application from the right Currying Function composition Compose Sequence – compose in reverse Compositions versus chains Programming with compose Mostly functional programming Handling events Functional reactive programming Reactivity Putting it all together Summary 5. Category Theory Category theory Category theory in a nutshell Type safety Object identities Functors Creating functors Arrays and functors Function compositions, revisited Monads Maybes Promises Lenses jQuery is a monad Implementing categories Summary 6. Advanced Topics and Pitfalls in JavaScript Recursion Tail recursion The Tail-call elimination Trampolining The Y-combinator Memoization Variable scope Scope resolutions Global scope Local scope Object properties Closures Gotchas Function declarations versus function expressions versus the function constructor Function declarations Function expressions The function constructor Unpredictable behavior Summary 7. Functional and Object-oriented Programming in JavaScript JavaScript – the multi-paradigm language JavaScript's object-oriented implementation – using prototypes Inheritance JavaScript's prototype chain Inheritance in JavaScript and the Object.create() method Mixing functional and object-oriented programming in JavaScript Functional inheritance Strategy Pattern Mixins Classical mixins Functional mixins Summary A. Common Functions for Functional Programming in JavaScript B. Glossary of Terms Index
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