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 Unit?

Until now, we've seen that every data type creates an instance containing some **value**. An `int` has numbers, whereas a `string` has characters. 

However, there is a special type in Reason used to represent an *empty* value. This is the **unit** data type. As the name suggests, it is just a single unit without any value. The unit type is represented by parentheses, `()`.

# The Purpose of Using Unit

So, where would the unit type be useful? The answer lies in functions. There exist functions in which we do not need to pass any arguments. Such a function could simply be printing something to the console or making computations not dependent on specific arguments.

In such a case, the parameter type of the function is `unit`.

# Example
Let's take a look at the `simplePrint()` function which prints "Hello World":

This lesson will highlight the features and uses of the unit data type.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

The Unit Data Type

What is Unit?