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 must implement the `countEven()` function which counts the number of even integers in a list. Since a list can't be iterated like an array, you must use pattern matching and recursion to solve this problem.

## Sample Input
```
list = [10, 3, 17, 23, 40, 22, 99]
```

## Sample Output
```
3
```

# Coding Challenge
Think carefully about the logic behind this exercise before moving on to the actual implementation. We already know that a list can be destructured into its `head` and `...tail`. Use this to create the required function.

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

Good luck!

Use pattern matching to count the number of even integers in a list.

A Brief Introduction

Data Types

Identifiers

Data Structures

Conditional Expressions

Functions

Loops

Variants

Objects

Exercise: Count Even Integers in a List

Problem