Explore ReasonML's growing popularity and its strong-typed syntax for JavaScript. Learn about creating data objects, functions, and data structures through interactive quizzes and exercises.

ReasonML has been skyrocketing in popularity lately, and for good... reason. Very recently developed by Facebook, it provides users a strong-typed, clean, and efficient syntax for JavaScript, which makes it great for web development. 

This course will get you up to speed programming in Reason. You'll start by learning how to create simple data objects and build up to more powerful tools such as functions and data structures. Along the way, interactive quizzes and exercises will help you gain a stronger grasp of the language.

Anyone looking to put themselves on the cutting-edge of web development would be well served to have a look at this course.

Functional Programming with ReasonML

# What is a Variant?

A variant allows us to choose between different data types when creating an object. We are not restricted to a single type as we are with an `int` or `string`. 

In this sense, a variant can be thought of as a *type containing mutually exclusive types*.


# Constructors 
The types contained in a variant are not the basic data types provided by Reason. Instead, these types are known as **constructors**. 

Their names can be anything and must always start with a capital letter. We'll see the inner workings of a constructor in the next lesson.



This lesson showcases the main structure of the variant data type.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Variant Types

What is a Variant?