# Leap

Given a year, report if it is a leap year.

The tricky thing here is that a leap year in the Gregorian calendar occurs:

```text
on every year that is evenly divisible by 4
  except every year that is evenly divisible by 100
    unless the year is also evenly divisible by 400
```

For example, 1997 is not a leap year, but 1996 is.  1900 is not a leap
year, but 2000 is.

If your language provides a method in the standard library that does
this look-up, pretend it doesn't exist and implement it yourself.

## Notes

Though our exercise adopts some very simple rules, there is more to
learn!

For a delightful, four minute explanation of the whole leap year
phenomenon, go watch [this youtube video][video].

[video]: http://www.youtube.com/watch?v=xX96xng7sAE
## Source

JavaRanch Cattle Drive, exercise 3 [http://www.javaranch.com/leap.jsp](http://www.javaranch.com/leap.jsp)

## Building and testing
You will need the node package manager (npm) installed - download from [here](https://www.npmjs.com/get-npm)
There is one time setup for each exercise, which may take a few minutes:
```
npm install
```

Open two shells, and in the first, start the build process.
```
npm start
```

In the second, start the tests running.
```
npm test
```

As you edit the code, the two processes will continually rebuild and rerun the tests.