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.
Go through the setup instructions for JavaScript to install the necessary dependencies:
http://exercism.io/languages/javascript/installation
The provided test suite uses Jasmine. You can install it by opening a terminal window and running the following command:
npm install -g jasmine
Run the test suite from the exercise directory with:
jasmine phone-number.spec.js
In many test suites all but the first test have been marked "pending".
Once you get a test passing, activate the next one by changing xit
to it
.
Event Manager by JumpstartLab http://tutorials.jumpstartlab.com/projects/eventmanager.html
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
var PhoneNumber = require('./phone-number');
describe('PhoneNumber()', function () {
it('cleans the number', function () {
var phone = new PhoneNumber('(223) 456-7890');
expect(phone.number()).toEqual('2234567890');
});
xit('cleans numbers with dots', function () {
var phone = new PhoneNumber('223.456.7890');
expect(phone.number()).toEqual('2234567890');
});
xit('cleans numbers with multiple spaces', function () {
var phone = new PhoneNumber('223 456 7890 ');
expect(phone.number()).toEqual('2234567890');
});
xit('invalid when 9 digits', function () {
var phone = new PhoneNumber('123456789');
expect(phone.number()).toEqual(null);
});
xit('invalid when 11 digits does not start with a 1', function () {
var phone = new PhoneNumber('22234567890');
expect(phone.number()).toEqual(null);
});
xit('valid when 11 digits and starting with 1', function () {
var phone = new PhoneNumber('12234567890');
expect(phone.number()).toEqual('2234567890');
});
xit('valid when 11 digits and starting with 1 even with punctuation', function () {
var phone = new PhoneNumber('+1 (223) 456-7890');
expect(phone.number()).toEqual('2234567890');
});
xit('invalid when more than 11 digits', function () {
var phone = new PhoneNumber('321234567890');
expect(phone.number()).toEqual(null);
});
xit('invalid with letters', function () {
var phone = new PhoneNumber('123-abc-7890');
expect(phone.number()).toEqual(null);
});
xit('invalid with punctuations', function () {
var phone = new PhoneNumber('123-@:!-7890');
expect(phone.number()).toEqual(null);
});
xit('invalid if area code does not start with 2-9', function () {
var phone = new PhoneNumber('(123) 456-7890');
expect(phone.number()).toEqual(null);
});
xit('invalid if exchange code does not start with 2-9', function () {
var phone = new PhoneNumber('(223) 056-7890');
expect(phone.number()).toEqual(null);
});
});
'use strict';
class PhoneNumber {
constructor(input) {
this._number = this._clean(input);
}
_clean(input) {
input = input.replace(/[-.() ]/g, '');
if (input.length === 11 && input[0] == '1') {
return input.substring(1, 11);
}
return input;
}
areaCode() {
return this._number.substring(0, 3);
}
number() {
if (this._number.length === 10) {
return this._number;
}
return '0000000000';
}
toString() {
var part1 = this._number.substring(3, 6),
part2 = this._number.substring(6, 11);
return `(${this.areaCode()}) ${part1}-${part2}`;
}
}
module.exports = PhoneNumber;
A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.
Level up your programming skills with 3,449 exercises across 52 languages, and insightful discussion with our volunteer team of welcoming mentors. Exercism is 100% free forever.
Sign up Learn More
Community comments