JXA Update All Contacts with Country Codes

update_all_country_code.scpt.js

let formatPhoneNumber = (str) => {
    let cleaned = ('' + str).replace(/\D/g, '');
    let match = cleaned.match(/^(1|)?(\d{3})(\d{3})(\d{4})$/);

    if (match) {
        let intlCode = (match[1] ? '+' + match[1] : '+1')
        return [intlCode + ' ', '(', match[2], ') ', match[3], '-', match[4]].join('')
    }

    return null;
}

app = Application("Contacts");

let allPeople = app.people()

for (let i = 0; i < allPeople.length; i++) {
    let person = allPeople[i]
    console.log(person.firstName() + " " + person.lastName())
    
    let phoneNumbers = person.phones()
    for (let j = 0; j < phoneNumbers.length; j++) {
        let currNumber = phoneNumbers[j].value()
        let formattedNumber = formatPhoneNumber(currNumber)
        if (currNumber != null && formattedNumber != null & currNumber != formattedNumber) {
            console.log("changing number from " + currNumber + " to " + formattedNumber)
            phoneNumbers[j].value = formattedNumber
        }
    }
}

app.save()