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

/* Type definition */
type calculator = {. /* The . operator to indicate the closed object */
  add: (float, float) => float,
  subtract: (float, float) => float,
  multiply: (float, float) => float,
  divide: (float, float) => float
};

/* Object Creation */
let cal: calculator = {

  /* Public methods */
  pub add = (first, second) => first +. second;
  pub subtract = (first, second) => first -. second;
  pub multiply = (first, second) => first *. second;
  pub divide = (first, second) => first /. second;
};

Js.log(cal#add(10.5, 5.0));
Js.log(cal#subtract(10.5, 5.0));
Js.log(cal#multiply(10.5, 5.0));
Js.log(cal#divide(10.5, 5.0));

# Explanation
Since we are making a closed object, the `.` operator will be used in the type definition. After that, we simply declare the four methods we want in our object. The number of parameters and their types must be specified here.

The actual object simply contains the implementation for the public methods.



This lesson explains the solution to the calculator object exercise.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Solution Review: The Calculator Object