Book Image

Swift Functional Programming - Second Edition

By : Dr. Fatih Nayebi
Book Image

Swift Functional Programming - Second Edition

By: Dr. Fatih Nayebi

Overview of this book

Swift is a multi-paradigm programming language enabling you to tackle different problems in various ways. Understanding each paradigm and knowing when and how to utilize and combine them can lead to a better code base. Functional programming (FP) is an important paradigm that empowers us with declarative development and makes applications more suitable for testing, as well as performant and elegant. This book aims to simplify the FP paradigms, making them easily understandable and usable, by showing you how to solve many of your day-to-day development problems using Swift FP. It starts with the basics of FP, and you will go through all the core concepts of Swift and the building blocks of FP. You will also go through important aspects, such as function composition and currying, custom operator definition, monads, functors, applicative functors,memoization, lenses, algebraic data types, type erasure, functional data structures, functional reactive programming (FRP), and protocol-oriented programming(POP). You will then learn to combine those techniques to develop a fully functional iOS application from scratch
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Backend development


We want to develop a very simple backend for a Todo application. Please note that Vapor is in active development and our backend application will need regular updates to keep up. Therefore, our GitHub (https://github.com/PacktPublishing/Swift-Functional-Programming) repository will be updated frequently.

Model

We will start by creating our model. The code is as follows:

import Vapor 
import Fluent 

final class Todo: Model { 
    var id: Node? 
    var todoId: Int 
    var name: String 
    var description: String 
    var notes: String 
    var completed: Bool 
    var synced: Bool 

    var exists: Bool = false 

    init(node: Node, in context: Context) throws { 
        id = try node.extract("id") 
        todoId = try node.extract("todoId") 
        name = try node.extract("name") 
        description = try node.extract("description") 
        notes = try node.extract("notes") 
        completed = try node.extract("completed") 
        synced = try node.extract("synced...