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 
In this exercise, we will try to recreate a pedestrian crossing at a traffic stop.  You have to write the `pedestrian()` function which takes a   `car` variable as its argument. The `car` variable will be of the `option` type.

If there is no car (the value of `car` is `None`), the function will return "**Cross**". 

If the `Some()` constructor for `car` gets the string, "**Moving**", as its argument, the function will return "**Wait**".

For all other cases of `car`, the value returned by `pedestrian()` will be "**Check**".

## Sample Input
```
1. car: None

2. car: Some("Moving")

3. car: Some(anyString)
```

## Sample Output
```
1. pedestrian(): "Cross"

2. pedestrian(): "Wait"

3. pedestrian(): "Check"
```
# Coding Challenge
Think carefully about the logic behind this exercise before jumping to the implementation. You only need to create the `pedestrian()` method which returns the correct string based on the value of `car`.

`car` has already been created. You do not need to worry about it.

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

Good luck!


Let's create an optional type 'car' variable which determines the value of a 'pedestrian' variable.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Exercise: Pedestrian Movement

Problem Statement