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

You are given three strings, `str1`, `str2`. 

If `str1` is longer in length, `str2` will be appended to it. If `str2` is longer, `str1` will be appended to it. 

In case both of them have the same length, `str2` will be appended to `str1`.

## Sample Input 
```
str1 = "Venus"
str2 = "Neptune"
```

## Sample Output
```
"NeptuneVenus"
```

# Coding Challenge
Think carefully about how this problem can be solved based on the conditionals we have studied in this section. It may be a good idea to write down the logic on a piece of paper first.

> **Note**: You do not have to store the appended result anywhere. Just write the expression used for appending one string to the other.

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

Good luck!

Let's create conditions based on the lengths of strings.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Exercise: String Comparison

Problem Statement