LearnJavaScript/4_TelephoneNumberValidator at main · climberomes/LearnJavaScript · GitHub

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/*Telephone Number Validator
Return true if the passed string looks like a valid US phone number.

The user may fill out the form field any way they choose as long as it has the format of a valid US number.
The following are examples of valid formats for US numbers (refer to the tests below for other variants):

555-555-5555
(555)555-5555
(555) 555-5555
555 555 5555
5555555555
1 555 555 5555
For this challenge you will be presented with a string such as 800-692-7753 or 8oo-six427676;laskdjf.
Your job is to validate or reject the US phone number based on any combination of the formats provided above.
The area code is required. If the country code is provided, you must confirm that the country code is 1.
Return true if the string is a valid US phone number; otherwise return false.

Tests
Passed:telephoneCheck("555-555-5555") should return a boolean.
Passed:telephoneCheck("1 555-555-5555") should return true.
Passed:telephoneCheck("1 (555) 555-5555") should return true.
Passed:telephoneCheck("5555555555") should return true.
Passed:telephoneCheck("555-555-5555") should return true.
Passed:telephoneCheck("(555)555-5555") should return true.
Passed:telephoneCheck("1(555)555-5555") should return true.
Passed:telephoneCheck("555-5555") should return false.
Passed:telephoneCheck("5555555") should return false.
Passed:telephoneCheck("1 555)555-5555") should return false.
Passed:telephoneCheck("1 555 555 5555") should return true.
Passed:telephoneCheck("1 456 789 4444") should return true.
Passed:telephoneCheck("123**&!!asdf#") should return false.
Passed:telephoneCheck("55555555") should return false.
Passed:telephoneCheck("(6054756961)") should return false.
Passed:telephoneCheck("2 (757) 622-7382") should return false.
Passed:telephoneCheck("0 (757) 622-7382") should return false.
Passed:telephoneCheck("-1 (757) 622-7382") should return false.
Passed:telephoneCheck("2 757 622-7382") should return false.
Passed:telephoneCheck("10 (757) 622-7382") should return false.
Passed:telephoneCheck("27576227382") should return false.
Passed:telephoneCheck("(275)76227382") should return false.
Passed:telephoneCheck("2(757)6227382") should return false.
Passed:telephoneCheck("2(757)622-7382") should return false.
Passed:telephoneCheck("555)-555-5555") should return false.
Passed:telephoneCheck("(555-555-5555") should return false.
Passed:telephoneCheck("(555)5(55?)-5555") should return false.
Passed:telephoneCheck("55 55-55-555-5") should return false.
Passed:telephoneCheck("11 555-555-5555") should return false.

*/
const PHONE_CHARS = [
  '(',')','-'
];

//Valid US Numbers Start with 1
//Valid US Numbers are 10 or 11 digits long
function telephoneCheck(str) {
  str = str.replace(/\s/gi,'').split("");


  if(str.length < 10 || str.length > 14)
  {
    return false;
  }
  else if(str.length == 10)
  {
    //Must be all numbers no leading 1 considered
    console.log(10);
    return str.every(x => parseInt(x));
  }
  else if(str.length == 11)
  {
    //Must be all numbers with leading 1 considered
    console.log(11);
    console.log(str);
    return parseInt(str[0])===1 && telephoneCheck(str.splice(1,10).join(""));
  }
  else if(str.length == 12)
  {
    //Must be all numbers no leading 1 considered
    //must have xxx-xxx-xxxx or (xxx)xxx xxxx
    console.log(12);
    if(str[0] === PHONE_CHARS[0] && str[4] === PHONE_CHARS[1])
    {
      str.splice(4,1);
      str.shift();
      return str.every(x => parseInt(x));
    }
    else if(str[3]===PHONE_CHARS[2] && str[7]===PHONE_CHARS[2])
    {
      str.splice(3,1);
      str.splice(6,1);
      return str.every(x => parseInt(x));
    }
    else
    {
      return false;
    }
  }
  else if(str.length == 13)
  {
    //Must be 1xxx-xxx-xxxx
    //OR 1(xxx)xxxxxxx
    //OR (xxx)xxx-xxxx
    console.log(13);
    if(parseInt(str[0])===1)
    {
      return telephoneCheck(str.splice(1,12).join(""));
    }
    else if(str[0] === PHONE_CHARS[0]
    && str[4] == PHONE_CHARS[1]
    && str[8]== PHONE_CHARS[2]
    )
    {
      str.splice(8,1);
      str.splice(4,1);
      str.shift();
      return telephoneCheck(str.join(""));
    }
    else
    {
      return false;
    }
  }
  else if(str.length == 14)
  {
    //Must be 1(xxx)xxx-xxxx
    console.log(14);
    if(str[1]===PHONE_CHARS[0])
    {
      return parseInt(str[0])===1 && telephoneCheck(str.splice(1,13).join(""));
    }
    else
    {
      return false;
    }
  }
}

//console.log(telephoneCheck("555-555-5555"));
//console.log(telephoneCheck("(6054756961)"));
console.log("Sol: " + telephoneCheck("11 347-569-6111"));