Question

119

Updating JavaScript object-attributes from another object

rated 0 times [ 120] [ 1] / answers: 1 / hits: 51752 / 12 Years ago, fri, september 21, 2012, 12:00:00

I want to update an object that could look like this:

currentObject = {

    someValue : value,

    myObject : {

        attribute1 : foo,

        attribute2 : bar

    }

};

.. with an object that contains some changes i.e.:

updateObject = {

    myObject : {

        attribute2 : hello world

    }

};

At the end I would like to have currentObject updated so that:

currentObject.myObject.attribute2 == hello world

That should be posible for other objects as well..
As a solution I thought about iterating over the object and somehow take care of the namespace. But I wonder if there is an easy solution for that problem by using a library like jQuery or prototype.

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kinsley

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answered 12 Years ago griffinr · Accepted Answer

function update(obj/*, …*/) {

    for (var i=1; i<arguments.length; i++) {

        for (var prop in arguments[i]) {

            var val = arguments[i][prop];

            if (typeof val == object) // this also applies to arrays or null!

                update(obj[prop], val);

            else

                obj[prop] = val;

        }

    }

    return obj;

}

should do the trick: update(currentObject, updateObject). You might want to add some type checks, like Object(obj) === obj to extend only real objects with real objects, use a correct loop for arrays or hasOwnProperty tests.