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65 lines
2 KiB
Markdown
65 lines
2 KiB
Markdown
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# Phone Number
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Clean up user-entered phone numbers so that they can be sent SMS messages.
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The **North American Numbering Plan (NANP)** is a telephone numbering system used by many countries in North America like the United States, Canada or Bermuda. All NANP-countries share the same international country code: `1`.
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NANP numbers are ten-digit numbers consisting of a three-digit Numbering Plan Area code, commonly known as *area code*, followed by a seven-digit local number. The first three digits of the local number represent the *exchange code*, followed by the unique four-digit number which is the *subscriber number*.
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The format is usually represented as
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```
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(NXX)-NXX-XXXX
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```
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where `N` is any digit from 2 through 9 and `X` is any digit from 0 through 9.
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Your task is to clean up differently formated telephone numbers by removing punctuation and the country code (1) if present.
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For example, the inputs
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- `+1 (613)-995-0253`
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- `613-995-0253`
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- `1 613 995 0253`
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- `613.995.0253`
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should all produce the output
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`6139950253`
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**Note:** As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.
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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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Event Manager by JumpstartLab [http://tutorials.jumpstartlab.com/projects/eventmanager.html](http://tutorials.jumpstartlab.com/projects/eventmanager.html)
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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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