Learn Type-Driven Development: Benefit from type systems to build reliable and safe applications using ReasonML 3

by Yawar Amin, Kamon Ayeva

Overview

Type-driven development is an approach that uses a static type system to achieve results including safety and efficiency. Types are used to express relationships and other assumptions directly in the code, and these assumptions are enforced by the compiler before the code is run. Learn Type-Driven Development covers how to use these type systems to check the logical consistency of your code.
This book begins with the basic idea behind type-driven development. You’ll learn about values (or terms) and how they contrast with types. As you progress through the chapters, you’ll cover how to combine types and values inside modules and build structured types out of simpler ones. You’ll then understand how to express choices or alternatives directly in the type system using variants, polymorphic variants, and generalized algebraic data types. You’ll also get to grips with sum types, build sophisticated data types from generics, and explore functions that express change in the types of values. In the concluding chapters, you’ll cover advanced techniques for code reuse, such as parametric polymorphism and subtyping.
By end of this book, you will have learned how to iterate through a type-driven process of solving coding problems using static types, together with dynamic behavior, to obtain more safety and speed.

Product Details

ISBN-13:	9781788836494
Publisher:	Packt Publishing
Publication date:	12/26/2018
Sold by:	Barnes & Noble
Format:	eBook
Pages:	180
File size:	2 MB

About the Author

Yawar Amin is a software engineer working in Toronto, Canada. He has worked on data science-based recommendation systems, customer-facing applications, and large data engineering projects. In his spare time, he likes to read, write, and use the Oxford comma whenever he can. Kamon Ayeva is a web developer/DevOps engineer working with a variety of tools. He spends most of his time building projects using Python's powerful scripting capabilities, add-on libraries, and web frameworks such as Django or Flask. Kamon has been using Python in professional contexts for more than 12 years. Based on his recent experience of using the type system that was added to Python 3, as well as developing a user interface using the React framework, latterly, he has started exploring type-driven development in JavaScript.
Yawar Amin is a software engineer by profession, with a background in statistics and econometrics. He has worked professionally with Scala and JavaScript, and as a result, developed a keen interest in type-safe programming.
Kamon Ayeva is a web developer / DevOps engineer working with a variety of tools. He spends most of his time in building projects, using Python's powerful scripting capabilities, add-on libraries and web frameworks such as Django or Flask. Kamon has been using Python in professional contexts for more than 12 years. Based on his recent experience using the type system that was added to Python 3 as well as developing a user interface using the React framework, he lately started exploring type-driven development in JavaScript.

Table of Contents

Table of Contents

1. Start Type-Driven Development
2. Program with types and values
3. Package types and values together
4. Group values together in types
5. Put alternative values in types
6. Make types that can ‘slot in’ any other type
7. " Make types that represent operations"
8. "Reuse code with many different types"
9. "Extend types with new behavior"
10. "Bring it all together"