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

# The Structure 
The structure of an object is very similar to that of a record. A typical object contains three components:

## Values
These are the properties of the object. They are defined in the object body using the `val` keyword. The values of an object cannot be directly accessed from the outside.

Depending on our program, the values of an object can be mutable or immutable.

## Public Functions
Public functions are methods which can manipulate and use the object's values. They can be defined using the `pub` keyword. 

These functions can be accessed from the outside. They allow an interface between the object and the other parts of the program. 

In that sense, public functions can be considered open to the public.

## Private Functions

Like their public counterparts, private functions also have access to the object's values. However, they are hidden from the outside world and cannot be called directly. Instead, only public functions can call the private functions of an object.

Private functions can be defined using the `pri` keyword.


# Type Definition

So, let's get started and build a `rectangle` object. A good practice is to define the object's type first, just like we do for records. 

For object types, the `.` operator has to be used right after the scope of the definition begins. In the type definition, we only mention the names of the public methods and their return types.


In this lesson, we will create a rectangle object and study its properties.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Object Creation