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

As we've seen so far, keeping track of the type of data we have is very important. Languages like JavaScript or Python do not require that we mention the explicit type of a variable. 

In other languages like C++ or Java, we have to specify the type of a variable when declaring it. 

Reason has the best of both worlds! In the previous lesson, we saw how `let` bindings could automatically detect the data type of a value. However, if needed, we can explicitly specify the data type which our `let ` binding should have. 

## Type Annotations
The type of binding can be annotated next to the name of the identifier, preceded by the `:` keyword:

As we've seen so far, keeping track of the type of data we have is very important. Languages like JavaScript or Python do not require that we mention the explicit type of a variable. 

In other languages like C++ or Java, we have to specify the type of a variable when declaring it. 

Reason has the best of both worlds! In the previous lesson, we saw how `let` bindings could automatically detect the data type of a value. However, if needed, we can explicitly specify the data type which our `let ` binding should have. 

# Type Annotations
The type of binding can be annotated next to the name of the identifier, preceded by the `:` keyword:

This lesson will teach us how to explicitly set the type of our let binding.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Type-Specific Identifiers

Type Annotations