Javascript - elegant way to check object has required properties

Question

I\'m looking for an good / elegant way to validate that a javascript object has the required properties, so far this is what I have:

var fields = [\'name\',\         


        

Answer 1

I would do for a real check for empty strings, because 0 is falsy, but a value and not empty.

function validateFields(object, keys) {
    keys.forEach(function (k) {
        if (k in object) {
            console.log(k + ": " + object[k]);
            if (object[k] === '') {
                console.log(k + " exists but is empty");
            }
            return;
        }
        console.log(k + " doesn't exist in object");
    });
}

var fields = ['name', 'age', 'address', 'zeroString', 'zeroNumber'],
    info = { name: "John Doe", age: "", phone: "123-456-7890", zeroString: '0', zeroNumber: 0 };

validateFields(info, fields);