extract(object, string) : Uses the string as a path finder inside the object to retrieve the specified item. Returns undefined if anything went wrong in finding the item.

extract(object, string).js

function extract(obj, path) {
    try {
        return eval("obj." + path);
    } catch(e) {
        return undefined;
    }
}


var obj = {
    user: {
        order: {
            address : {
                city: 'Bangalore'
            }
        }
    }
}


extract(obj, 'user.order.address.city');

// 'Bangalore'

extract(obj, 'user.home.address.city');

// undefined