Phonewords
Two-way number-letter conversion as found on most phone dialers, according to ITU-T E.161.
Usage
Install the library:
npm install --save phonewords
Require the module and call one of its functions, depending on the desired direction of conversion:
let phonewords = require('phonewords');Numbers to Words
Convert a number to an array of possible character combinations:
phonewords.numbersToWords(2);
// => [ 'A', 'B', 'C' ]
phonewords.numbersToWords('2');
// => [ 'A', 'B', 'C' ]
phonewords.numbersToWords(22);
// => [ 'AA', 'AB', 'AC', 'BA', 'BB', 'BC', 'CA', 'CB', 'CC' ]
phonewords.numbersToWords(210);
// => [ 'A__', 'B__', 'C__' ]
phonewords.numbersToWords('+1 (201) ...');
// => [ '_A__', '_B__', '_C__' ]Because 0 and 1 do no correspond to any characters, they are replaced with underscores.
Note that this function has a quadratic time complexity with respect to the number of input digits and should not be used for especially long numbers.
Words to Numbers
Convert a string to a number:
phonewords.wordstoNumbers('phonewords');
// => '7466396737'
phonewords.wordstoNumbers('pHoNewoRDs');
// => '7466396737'
phonewords.wordstoNumbers('P H O N E W O R D S');
// => '7466396737'
phonewords.wordstoNumbers('ph0new0rd5');
// => '7406390735'
phonewords.wordstoNumbers('!@#$%^&*()');
// => ''Spaces and special characters are removed. Numerals are left unchanged.