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Phone Number

Welcome to Phone Number on Exercism's Go Track. If you need help running the tests or submitting your code, check out HELP.md.

Instructions

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

(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.

Additionally, a Format() function should produce the output

(613) 995-0253

and an AreaCode() function should output

613

Source

Created by

  • @mikegehard

Contributed to by

  • @Akasurde
  • @alebaffa
  • @bitfield
  • @da-edra
  • @ekingery
  • @ferhatelmas
  • @hilary
  • @ilmanzo
  • @johngb
  • @kytrinyx
  • @leenipper
  • @petertseng
  • @robphoenix
  • @sebito91
  • @soniakeys
  • @strangeman
  • @tleen
  • @tompao
  • @eklatzer

Based on

Event Manager by JumpstartLab - http://tutorials.jumpstartlab.com/projects/eventmanager.html

My Solution