ReasonML: First Look

1hAdvanced2020-02-28

Authors

J. David Eisenberg

Programmer and Instructor living in San Jose, California

Course details

Adding type annotations to JavaScript using TypeScript or similar tools can help with basic debugging, but types have much more to offer. ReasonML—a new syntax for OCaml that compiles to JavaScript—offers advanced developers new possibilities for greater readability, performance, and maintainability of code. ReasonML brings the strong typing and functional style of OCaml to the web in a syntax that’s familiar to JavaScript developers.

In this course, join instructor J. David Eisenberg as he details the most salient features of ReasonML. Explore fundamental concepts, including the built-in ReasonML data types and pattern matching. Learn about the ReasonML type system, defining your own data types, and the power of type inference—which lets you write code without having to manually specify types. Plus, take a look at how JavaScript and ReasonML interoperate as you create a ReasonReact project.

Skills covered

ReasonMLLearningProgramming LanguagesOpen SourceSoftware Development

Concepts

0. Introduction

01 - Why ReasonML could be the language for you
02 - Base knowledge and setup

1. ReasonML Fundamentals

03 - Variables and data types
04 - Functions and annotations
05 - Decisions with if and switch expressions
06 - Output with Js.log()
07 - Challenge - Quadratic formula
08 - Solution - Quadratic formula

2. The ReasonML Type System

09 - Creating your own data types
10 - Say goodbye to null and undefined
11 - Creating modules for reusable code
12 - Using collection types
13 - Creating record types
14 - Challenge - Generating random cakes
15 - Solution - Generating random cakes

3. Interoperating with JavaScript

16 - Web pages with ReasonReact

Conclusion

17 - Explore ReasonML resources