How can I properly write the following if statement with getLabel() - google-apps-script

Question

I'm getting the following error and would like to know how to rewrite this code properly.
ReferenceError: Function function getLabel() {/* */} can not be used as the left-hand side of assignment or as an operand of ++ or -- operator. (line 61, file "DLContactsToSheet")
var Phones = "";
for ( var g=0;g<contacts[i].getPhones().length;g++)
{
if (contacts[i].getPhones()[g].getLabel() = "MOBILE_PHONE") {
Phones += "C: "
} else if (contacts[i].getPhones()[g].getLabel() = "WORK_PHONE") {
Phones += "W: "
} else if (contacts[i].getPhones()[g].getLabel() = "HOME_PHONE") {
Phones += "H: "
} else {
Phones += "O: "
}
Phones += contacts[i].getPhones()[g].getPhoneNumber();
Phones += "\n";
}
try{ContactArray.push(Phones);}
catch(e){ContactArray.push("N/A")}

Answer 1

It would appear that the reference error is caused by an '=' rather than an '==' in your conditions.
Rewriting the conditions as if (phone.getLabel() == 'MOBILE_PHONE') { /* ... */ } etc should do the trick.

Answer 2

You need to hard code them, in order to fetch them.
Code
function fieldType() {
var contacts = ContactsApp.getContacts(), phones = [];
for(var i = 0, iLen = contacts.length; i < iLen; i++) {
var con = contacts[i], f = ContactsApp.Field;
var c = con.getPhones(f.MOBILE_PHONE), w = con.getPhones(f.HOME_PHONE), h = con.getPhones(f.WORK_PHONE);
phones = getNumber(phones, c, "C: ");
phones = getNumber(phones, w, "W: ");
phones = getNumber(phones, h, "H: ");
}
}
function getNumber(phones, type, prefix) {
var typeNumbers = [];
var pNumber = type.length > 0 ? type.map( function (d) { return prefix + d.getPhoneNumber() + "\n"; }) : null;
if(pNumber) {
typeNumbers.push(pNumber);
}
return phones.concat(typeNumbers);
}
Note
See method description for more info: getPhoneNumber()

Answer 3

You should probably store the value for each iteration in a variable before any conditional statements. A case-switch statement is probably also better suited for this.
for ( var g=0;g<contacts[i].getPhones().length;g++)
{
var phone_type = contacts[i].getPhones()[g].getLabel()
switch(phone_type) {
case "MOBILE_PHONE":
Phones += "C: "
break;
case "WORK_PHONE":
Phones += "W: "
break;
case "HOME_PHONE":
Phones += "H: "
break;
default:
Phones += "O: "
}
Phones += contacts[i].getPhones()[g].getPhoneNumber();
Phones += "\n";
}