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In this video we are going to learn about recursion. We will learn what recursion is, how to do it and why it is useful. Recursion is when a function calls itself until it doesn't. 
Start of demo
We will implement a countdown function. Start by declaring the functon.
let is just the new var.
Arrow functions is a shorter function syntax.
Recursion function example. It worked, but there was no stop condition.
Lets add the stop condition.
We have learnt what recursion is and a simple example of how to do it.
Why should we use it?
There are things recursion can do that loops cannot
Example: hierarchical records.
A good trick in programming - take some time to think about the goal.

Walk through of the code example
To a certain degree you can do this with loops. Only works for limited amount of nesting.
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