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Applied Functional Programming in Scala

Virendra Kumar Mishra

This audiobook is narrated by a digital voice. DESCRIPTION Functional programming is transforming how we build robust, scalable, and maintainable software by prioritizing clarity and predictability. It emphasizes what to compute by defining...

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Title Page

1/2/2026
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Copyright Page

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Dedication Page

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About the Author

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About the Reviewers

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Acknowledgement

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Preface

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Table of Contents

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1. Fundamentals of Functional Programming

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Introduction

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Structure

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Objectives

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Functional programming

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Programming paradigm

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Applying and composing functions

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Declarative programming

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Trees of expression

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Map values

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Sequence of imperative statements

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Update running state of program

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Function as first-class citizen

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Function as literal

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Function as input parameters

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Function as return value

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Functions stored in data structures

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Pure function

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Referential transparency

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Immutability

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Lazy evaluation

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Optimization

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User defined control structures

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Infinite data structures

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Function composition

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Higher order function

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Statements versus expressions

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Advantages and usage of functional programming

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Unit testing

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Concurrency

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Debugging

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Easier to reason about

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Difference between functional and object-oriented approach

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Conclusion

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2. Implementation of Category Theory

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Introduction to category theory

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Category

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Properties

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Laws

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Morphism

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Common types of morphisms

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Composition of morphisms

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Identity morphisms

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Sets

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Usage

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Semigroups

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Definition

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Monoid

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Functors

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Applicative functor

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Foldable

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Traversal

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Monad

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Reader monad

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Writer monad

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State monad

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Optics

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3. Introduction to Scala

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Scala

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Scala as object-oriented

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Scala as functional

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Scala as statically typed

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Scala as extensible

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Scala interoperates with Java

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Hands-on Scala

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Scala installation

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Scala IDE

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Scala for functional programming

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Function as first-class values

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Function returned as output

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Lambda functions

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Closures

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Currying

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Partial applied function

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Function implementation

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Option[T]

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Try[T]

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Either [+A, +B]

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4. Understanding Cats

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Understanding Cats

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Type classes

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Functor

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Invariant

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Invariant usage

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InvariantMonoidal

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Contravariant

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Contravariant usage

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Bifunctor

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Applicative

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Bifoldable

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Arrow

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Semigroup

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SemigroupK

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MonoidK

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Traverse

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Non-empty traverse

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Alternative

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Comonad

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Bimonad

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Eq

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Show

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Parallel

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Reducible

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Data types

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Transformers

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Free implementations

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Cats testing

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5. Understanding ZIO

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Introduction to ZIO

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ZIO type aliases

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UIO[A]

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URIO[R, A]

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Task[A]

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RIO[R, A]

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IO[E, A]

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ZIO control flow

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ZIO Conditional flow

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When expression

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Unless expression

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ifZIO expression

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ZIO loop flow

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Loop expression

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Iterate expression

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Foreach expression

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ZIO error management

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Error recovery

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Error accumulation

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Using ZIO.collectAllParN for error accumulation

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Using ZIO.collectAllPar for error accumulation

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Error channel operators

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ZIO layer

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Basics of ZLayer

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Construction

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Composition

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Providing environment

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Using services

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Lifecycle management

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ZIO concurrency

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ZIO fibers

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ZIO synchronization

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ZIO STM

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STM composition

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Fiber-scoped transactions

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ZIO resource management

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ZIO testing

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Test environments

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Using zio.test package

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Running tests

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Asynchronous testing

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Mocking dependencies

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6. Effects Implementation in Pure Way

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Effects and side effects

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Side effects as blocker

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Handling side effects

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Exceptions as side effects

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Functional exception handling

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I/O as side effects

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Functional I/O implementations

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Cats Effects

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ZIO effects

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7. Functional Pattern Implementation

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Domain-specific language

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Using DSL to solve problem statement

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Initial encoding

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Tagless final

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Free functor

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Applications

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Free monad

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Free monad in category theory

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Free applicative

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Free applicative in category theory

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8. Functional Tools

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Monocle for optics

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Setting up dependencies

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Monix for asynchrony

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Sub projects

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Caliban

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GraphQL schema

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Setting up server

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Circe

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Working with Circe

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ZIO scheduling

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PureConfig

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Functional Streams for Scala

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FS2 sub projects

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Cats collection

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Cats retry

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Setting dependency

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9. Web Implementation in Functional Way

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Functional web

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Functional web implementation

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Advantages of functional web

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