Parse phone number components from a string, string manipulation flavor. Tends to be more bulletproof than regex flavor.

getPhoneNumberComponents.js

/**
 * Given a raw phone number, parse out individual components.
 *
 * @param {String} raw Raw phone number to parse
 *
 * @return {Object} Returns object containing countryCode, areaCode, officeCode
 * and stationNumber components
 */
function getPhoneNumberComponents ( raw ) {
  // First cut raw string down to just numbers
  let numbers = raw
    .replace( /\s/g, '' )
    .split( '' )
    .filter( ( char ) => { return ! isNaN( +char ); });

  // If length of numbers is < 7, it's not a valid number
  if ( numbers.length < 7 ) { return null; }

  // Then split into prefix (country/area code) and suffix
  let suffix = numbers.splice( numbers.length - 7, 7 );
  let prefix = numbers;

  // Deal with prefix
  let areaCode    = prefix.splice( prefix.length - 3, 3 );
  let countryCode = prefix;

  // Split suffix into office code/station number
  let officeCode    = suffix.splice( 0, 3 );
  let stationNumber = suffix;

  // And shoot back combined results
  return {
    countryCode:   countryCode.join( '' ),
    areaCode:      areaCode.join( '' ),
    officeCode:    officeCode.join( '' ),
    stationNumber: stationNumber.join( '' )
  };
}