book

Functional JavaScript

by Michael Fogus

June 2013

Intermediate to advanced

258 pages

6h 32m

English

O'Reilly Media, Inc.

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What Is Underscore?Getting UnderscoreUsing UnderscoreThe Source Code for Functional JavaScriptRunning the Code in This BookNotational ConventionsWhom Functional JavaScript Is Written ForA Roadmap for Functional JavaScriptConventions Used in This BookUsing Code ExamplesSafari® Books OnlineHow to Contact UsAcknowledgments
The Case for JavaScriptSome Limitations of JavaScriptGetting Started with Functional ProgrammingWhy Functional Programming MattersFunctions as Units of AbstractionEncapsulation and HidingFunctions as Units of BehaviorData as AbstractionA Taste of Functional JavaScriptOn SpeedThe Case for UnderscoreSummary
Functions as First-Class ThingsJavaScript’s Multiple ParadigmsImperative programmingPrototype-based object-oriented programmingMetaprogrammingApplicative ProgrammingCollection-Centric ProgrammingOther Examples of Applicative ProgrammingreduceRightfindrejectallanysortBy, groupBy, and countByDefining a Few Applicative FunctionsData Thinking“Table-Like” DataSummary
Global ScopeLexical ScopeDynamic ScopeJavaScript’s Dynamic ScopeFunction ScopeClosuresSimulating ClosuresFree variablesShadowingUsing ClosuresClosures as an AbstractionSummary
Functions That Take Other FunctionsThinking About Passing Functions: max, finder, and bestTightening it up a bitMore Thinking About Passing Functions: repeat, repeatedly, and iterateUntilUse functions, not valuesI said, “Use functions, not values”Functions That Return Other FunctionsCapturing Arguments to Higher-Order FunctionsCapturing Variables for Great GoodTake care when mutating valuesA Function to Guard Against Nonexistence: fnullPutting It All Together: Object ValidatorsSummary
The Essence of Functional CompositionMutation Is a Low-Level OperationCurryingTo Curry Right, or To Curry LeftAutomatically Currying ParametersBuilding new functions using curryingCurrying three parameters to implement HTML hex color buildersCurrying for Fluent APIsThe Disadvantages of Currying in JavaScriptPartial ApplicationPartially Applying One and Two Known ArgumentsPartially Applying an Arbitrary Number of ArgumentsPartial Application in Action: PreconditionsStitching Functions End-to-End with ComposePre- and Postconditions Using CompositionSummary

Self-Absorbed Functions (Functions That Call Themselves)Graph Walking with RecursionDepth-First Self-Recursive Search with MemoryTail (self-)recursionRecursion and Composing Functions: Conjoin and DisjoinCodependent Functions (Functions Calling Other Functions That Call Back)Deep Cloning with RecursionWalking Nested ArraysToo Much Recursion!GeneratorsThe Trampoline Principle and CallbacksRecursion Is a Low-Level OperationSummary
PurityThe Relationship Between Purity and TestingSeparating the Pure from the ImpureProperty-Testing Impure FunctionsPurity and the Relationship to Referential TransparencyPurity and the Relationship to IdempotenceImmutabilityIf a Tree Falls in the Woods, Does It Make a Sound?Immutability and the Relationship to RecursionDefensive Freezing and CloningObserving Immutability at the Function LevelObserving Immutability in ObjectsObjects Are Often a Low-Level OperationPolicies for Controlling ChangeSummary
ChainingA Lazy ChainPromisesPipeliningData Flow versus Control FlowFinding a Common ShapeA Function to Simplify Action CreationSummary
Data OrientationBuilding Toward FunctionsMixinsCore Prototype MungingClass HierarchiesChanging HierarchiesFlattening the Hierarchy with MixinsNew Semantics via Mixin ExtensionNew Types via Mixin MixingMethods Are Low-Level Operations}).call(“Finis”);
Functional Libraries for JavaScriptFunctional JavaScriptUnderscore-contribRxJSBilbyallong.esOther Functional LibrariesFunctional Programming Languages Targeting JavaScriptClojureScriptCoffeeScriptRoyElm
Papers/Books/Blog Posts/TalksPresentationsBlog PostsJournal Articles

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About the Author

Michael Fogus is software developer with experience in distributedsimulation, machine vision, and expert systems construction. He's actively involved in the Clojure and Scala communities.

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Publisher Resources

ISBN: 9781449360757Errata Page