const obj =
{
"name": "John Doe",
"age": 39,
"Street": "Hauptstraße 5"
}
// street is undefined (its uppercase)
var { name: fullname, age, street } = obj;
// You need an array [...]
// if you will check one variable
TestUndef([age]);
// or more
TestUndef([fullname, street, age]);
console.log("All Ok");
function TestUndef(what) {
for (var that of what) {
if (typeof (that) == "undefined") {
throw new Error(`UNDEFINDED OBJECTS!`);
}
}
}
// no write "street" in line 5 lowercase, then its all ok.