Enumerating Objects in JavaScript

Enumerating through objects is something I only occassionally do in JavaScript, but when it does come up, I always find it a bit unintuitive. Here's some sample code for the future me that is faced with this task again:

var dataObject = {
    foo: "bar",
    one: "fish",
    hello: "world"
};

var key;
for (key in dataObject)
{
    document.write("Key: " + key ", Value: " + dataObject[key]);
    document.write("\n");
}

This code will produce the following lines:

Key: foo, Value: bar
Key: one, Value: fish
Key: hello, Value: world