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We are working towards making exercises stand-alone. That is to say: no more generating READMEs on the fly. This will give maintainers more control over each individual exercise README, and it will also make some of the backend logic for delivering exercises simpler. The README template uses the Go text/template package, and the default templates generate the same READMEs as we have been generating on the fly. See the documentation in [regenerating exercise readmes][regenerate-docs] for details. The READMEs can be generated at any time using a new 'generate' command in configlet. This command has not yet landed in master or been released, but can be built from source in the generate-readmes branch on [configlet][]. [configlet]: https://github.com/exercism/configlet [regenerate-docs]: https://github.com/exercism/docs/blob/master/maintaining-a-track/regenerating-exercise-readmes.md
63 lines
1.5 KiB
Markdown
63 lines
1.5 KiB
Markdown
# Leap
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Given a year, report if it is a leap year.
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The tricky thing here is that a leap year in the Gregorian calendar occurs:
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```plain
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on every year that is evenly divisible by 4
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except every year that is evenly divisible by 100
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unless the year is also evenly divisible by 400
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```
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For example, 1997 is not a leap year, but 1996 is. 1900 is not a leap
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year, but 2000 is.
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If your language provides a method in the standard library that does
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this look-up, pretend it doesn't exist and implement it yourself.
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## Notes
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Though our exercise adopts some very simple rules, there is more to
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learn!
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For a delightful, four minute explanation of the whole leap year
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phenomenon, go watch [this youtube video][video].
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[video]: http://www.youtube.com/watch?v=xX96xng7sAE
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## Elm Installation
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Refer to the [Exercism help page](http://exercism.io/languages/elm) for Elm
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installation and learning resources.
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## Writing the Code
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The first time you start an exercise, you'll need to ensure you have the
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appropriate dependencies installed.
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```bash
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$ npm install
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```
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Execute the tests with:
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```bash
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$ npm test
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```
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Automatically run tests again when you save changes:
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```bash
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$ npm run watch
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```
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As you work your way through the test suite, be sure to remove the `skip <|`
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calls from each test until you get them all passing!
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## Source
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JavaRanch Cattle Drive, exercise 3 [http://www.javaranch.com/leap.jsp](http://www.javaranch.com/leap.jsp)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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