Question

I have 1 object coming from the server with multiple properties in which I want to hydrate it into a new object, changing the name of 1 property and keeping the rest.

Code:

JSON: { UserId: 1, Name: "Woo", Age: 10 }

The format of the object I want it in:

var newObj = {}
newObj.id = jsonObj.UserId;
//Everything property below here is the same. How can i prevent writing this code?
newObj.Name = jsonObj.Name;
newObj.Age = jsonObj.Age;

What I’m doing is based on this answer, trying to parse some json into a format that requires me to change the name of 1 property.

Answer 1

For such a simple case, you could do something like:

var newObj = {id: jsonObj.UserId, Name: jsonObj.Name, Age: jsonObj.Age};

For a more complex object with a large number of fields, you might prefer something like:

//helper function to clone a given object instance
function copyObject(obj) {
    var newObj = {};
    for (var key in obj) {
        //copy all the fields
        newObj[key] = obj[key];
    }

    return newObj;
}


//now manually make any desired modifications
var newObj = copyObject(jsonObj);
newObj.id = newObj.UserId;