Getting started with functional programming in Swift

Part 1: Concepts of functional programming Part 2: Structured to allow hands-on learning of frequently used techniques Part 3: Converting an existing program to functional programming Part 4: Developing an iOS app that applies UI

• Case-based, not theory-based
• Explain with direct code rather than explaining difficult concepts or terms.
• It is structured as a hands-on course so that you can learn by typing directly.
• Pair programming method allows learning functional thinking and programming process.
• Includes projects that proceed from functional design to UI app implementation.

• Operating environment: Mac OS, XCode 9 or later
• Prerequisites: Swift 4.x

Functional programming is something that many developers want to learn now.

In recent years, interest in functional programming (FP) has grown significantly. Discussions about FP have become a common sight at meetups and seminars across various fields. In particular, we often see examples of refactoring existing code using FP techniques, and we often hear encouragement to widely adopt this beneficial approach. However, given that many developers are accustomed to the object-oriented programming paradigm, transitioning to a new paradigm requires significant effort. This is different from learning a new language and mastering its syntax.

Why is it difficult to move to a functional programming paradigm?

A programmer's cognitive system (paradigm) is deeply involved in every process, from designing the program structure to writing the source code. Assuming this programmer has spent their entire life programming within the object-oriented programming paradigm, learning functional programming anew can present the following challenges:

• The very idea of not changing the value of a variable feels strange. To put it more developer-friendly, the very idea of programming without state feels incredibly awkward.
• The concept of "currying" in FP is also strange. I don't understand what it means to create a function that creates a function that creates a function (that's not a typo).
• It's strange to control the behavior of a program without changing its data. It just feels weird.

Introduction of knowledge sharers

A mobile developer with 15 years of experience. I'm a passionate mobile developer and have been working on iOS since 2008.

• iOS Meetup "Let Us: Go!" Presenters for Fall 2017, Spring 2018, and Summer 2018. All topics were FP-related!
• Embedded/Mobile Software Programmer
• Embedded/Application Programming/Arduino/3D Printer Instructor
• Ministry of Employment and Labor's Spec-Transcending Mentor School Mentor
• Embedded Software Industry Association member
• Blog , GitHub