private int mapStringToEmailType(String label) {
        int emailType;
        switch (label) {
            case "home":
                emailType = ContactsContract.CommonDataKinds.Email.TYPE_HOME;
                break;
            case "work":
                emailType = ContactsContract.CommonDataKinds.Email.TYPE_WORK;
                break;
            case "mobile":
                emailType = ContactsContract.CommonDataKinds.Email.TYPE_MOBILE;
                break;
            case "other":
                emailType = ContactsContract.CommonDataKinds.Email.TYPE_OTHER;
                break;
            case "personal":
                emailType = ContactsContract.CommonDataKinds.Email.TYPE_HOME;
                break;
            default:
                emailType = ContactsContract.CommonDataKinds.Email.TYPE_CUSTOM;
                break;
        }
        return emailType;
    }
Retrieves <code>contact</code> for contact, or <code>null</code> if not
available.

@param contactId contact identifier, <code>recordID</code>
android/src/main/java/com/rt2zz/reactnativecontacts/impl/ContactsManagerImpl.java