Sandbox::https://github.com/sibalonecoding-code/JavaScript/blob/master/String/FormatPhoneNumber.js

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/**

* @description - function that takes 10 digits and returns a string of the formatted phone number e.g.: 1234567890 -> (123) 456-7890

* @param {string} phoneNumber

* @returns {string} - Format to (XXX) XXX-XXXX pattern

const formatPhoneNumber = (phoneNumber) => {

if (phoneNumber.length !== 10 || isNaN(phoneNumber)) {

// return "Invalid phone number."

throw new TypeError('Invalid phone number!')

}

let index = 0

return '(XXX) XXX-XXXX'.replace(/X/g, () => phoneNumber[index++])

}

export default formatPhoneNumber