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

let rec fact = (n: int) => {
  /* Check if n is 0 or 1 */
  switch (n) {
    | 0 => 1; /* Base case */
    | n => n * fact(n - 1) /* Make recursive calls and multiply each time */
  };
};

Js.log(fact(5));

# Explanation
This problem can be solved easily using recursion. We already know that in the simplest case (base case) of `n = 0`, the factorial is `1`.

In all other cases, we have to compute `n * (n - 1)`, so we can make a recursive call for that.

Since we have only two basic scenarios, we can handle them using a `switch` expression. For the recursive call, the current value of `n` is multiplied by the value retrieved from the next recursive call.

This lesson explains the solution for the factorial of a number exercise.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Solution Review: The Factorial of a Number

Solution