71 lines
2.1 KiB
Markdown
71 lines
2.1 KiB
Markdown
|
# Phone Number
|
||
|
|
|
||
|
|
Clean up user-entered phone numbers so that they can be sent SMS messages.
|
||
|
|
|
||
|
|
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`.
|
||
|
|
|
||
|
|
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*.
|
||
|
|
|
||
|
|
The format is usually represented as
|
||
|
|
|
||
|
|
```text
|
||
|
|
(NXX)-NXX-XXXX
|
||
|
|
```
|
||
|
|
|
||
|
|
where `N` is any digit from 2 through 9 and `X` is any digit from 0 through 9.
|
||
|
|
|
||
|
|
Your task is to clean up differently formatted telephone numbers by removing punctuation and the country code (1) if present.
|
||
|
|
|
||
|
|
For example, the inputs
|
||
|
|
- `+1 (613)-995-0253`
|
||
|
|
- `613-995-0253`
|
||
|
|
- `1 613 995 0253`
|
||
|
|
- `613.995.0253`
|
||
|
|
|
||
|
|
should all produce the output
|
||
|
|
|
||
|
|
`6139950253`
|
||
|
|
|
||
|
|
**Note:** As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.
|
||
|
|
|
||
|
|
## Running tests
|
||
|
|
|
||
|
|
Execute the tests with:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
$ elixir phone_number_test.exs
|
||
|
|
```
|
||
|
|
|
||
|
|
### Pending tests
|
||
|
|
|
||
|
|
In the test suites, all but the first test have been skipped.
|
||
|
|
|
||
|
|
Once you get a test passing, you can unskip the next one by
|
||
|
|
commenting out the relevant `@tag :pending` with a `#` symbol.
|
||
|
|
|
||
|
|
For example:
|
||
|
|
|
||
|
|
```elixir
|
||
|
|
# @tag :pending
|
||
|
|
test "shouting" do
|
||
|
|
assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
|
||
|
|
end
|
||
|
|
```
|
||
|
|
|
||
|
|
Or, you can enable all the tests by commenting out the
|
||
|
|
`ExUnit.configure` line in the test suite.
|
||
|
|
|
||
|
|
```elixir
|
||
|
|
# ExUnit.configure exclude: :pending, trace: true
|
||
|
|
```
|
||
|
|
|
||
|
|
For more detailed information about the Elixir track, please
|
||
|
|
see the [help page](http://exercism.io/languages/elixir).
|
||
|
|
|
||
|
|
## Source
|
||
|
|
|
||
|
|
Event Manager by JumpstartLab [http://tutorials.jumpstartlab.com/projects/eventmanager.html](http://tutorials.jumpstartlab.com/projects/eventmanager.html)
|
||
|
|
|
||
|
|
## Submitting Incomplete Solutions
|
||
|
|
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
|