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

# Problem Statement
For an integer, `n`, the factorial is its product with all the positive integers before it. The factorial is denoted by the `!` character.

In this exercise, you need to write the `fact()` method which takes in an integer and returns its factorial. While we have already done this using recursion, you should now use the iterative approach.

>**Note**: For `0` or `1`, the factorial is always `1`.

For simplicity, we do not need to cater for negative integers.

## Sample Input

```
fact(5)
```
## Sample Output
```
120
```

# Coding Challenge
Think carefully about the logic behind the algorithm before jumping on to the implementation. This problem shouldn't be too hard if you understand the basics of loops.

If you feel stuck, you can always refer to the solution review in the next lesson. 

Good luck!

Let's calculate the factorial of an integer.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Exercise: The Factorial of a Number (Loops)

Problem Statement