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

# Global Scope
Throughout this section, we've been creating and manipulating data in the outermost layer of our ReasonML program. This layer is known as the **global scope.** 

Variables created in the *global scope* are accessible everywhere in the program globally. 

# Local Scope
As we'll see later in the course, several operations take us into an inner layer, which is also known as a **local scope**. This is a contained environment. The variables and data generated in a local scope are not accessible from outside. 

As soon as a local scope ends, all its data is removed from memory and cannot be recovered. In this sense, a local scope determines the lifetime of the local identifiers inside it. 

A local scope is enclosed within the `{}` brackets. Let's take a look at an example:

This lesson will explain how the scope can affect the lifetime of an identifier.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Scope

Global Scope