# About this series

This is series of daily JavaScript coding challenges... for both beginners and advanced users.

Each day I’m gone present you a very simple coding challenge, together with the solution. The solution is intentionally written in a didactic way using classic JavaScript syntax in order to be accessible to coders of all levels.

Solutions are designed with increase level of complexity.

## Today’s coding challenge

```
Calculate the average of the numbers in an array of numbers
```

(scroll down for solution)

## Code newbies

If you are a code newbie, try to work on the solution on your own. After you finish it, or if you need help, please consult the provided solution.

## Advanced developers

Please provide alternative solutions in the comments below.

You can solve it using functional concepts or solve it using a different algorithm... or just solve it using the latest ES innovations.

By providing a new solution you can show code newbies different ways to solve the same problem.

## Solution

```
// Solution for challenge11
function averageArray(ar)
{
var n = ar.length;
var sum = 0;
for(var i = 0; i < n; i++)
{
sum += ar[i];
}
return sum / n;
}
var ar = [1, 3, 9, 15, 90];
var avg = averageArray(ar);
println("Average: ", avg);
```

To quickly verify this solution, copy the code above in this coding editor and press "Run".

Note: The solution was originally designed for codeguppy.com environment, and therefore is making use of

`println`

. This is the almost equivalent of`console.log`

in other environments. Please feel free to use your preferred coding playground / environment when implementing your solution.

## Discussion

My take at the challenge using a recursive function, immutability and the incremental average algorithm. Also added a generator function to easily generate a generator of numbers in a given range.