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

We've already observed how normal `let` binding variables are *immutable*. One approach was to redefine the binding with a new value.

However, there is an actual way to make `let` bindings mutable! 

## The `ref()` Wrapper
In order to achieve mutability, the value being assigned to a variable must be enclosed in a `ref()` wrapper. To assign a new value, we must use the `:=` operator:

We've already observed how normal `let` binding variables are *immutable*. One approach was to redefine the binding with a new value.

However, there is an actual way to make `let` bindings mutable! 

# The `ref()` Wrapper
In order to achieve mutability, the value being assigned to a variable must be enclosed in a `ref()` wrapper. To assign a new value, we must use the `:=` operator:

In this lesson, we'll make a mutable let variable using the ref() wrapper.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Mutability

The `ref()` Wrapper