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mszczepaniak (4) [Avatar] Offline
The second to the last paragraph in section 1.3.6 says the following:

The x in the loop is the attribute name, and person[x] is the same as using the
person["name"] syntax above to show the value of that attribute of the object.

The way this is written is very confusing. x is not the just the name attribute. It is a pointer to all the attributes in the person object. I'm sure that this is what you meant, but I had to stare at this awhile and create the following page to clarify this point:

<!doctype html>
<script type="text/javascript" src="d3.min.js"></script>
<script type="text/javascript">
var person = {name: "Charlie", age: 55, employed: true, childrenNames:["Ruth", "Charlie Jr."]};
for (x in person) {console.log(x); console.log(person[x]);}

running script from section 1.3.6...

The (Firebug) console output looks like this:

["Ruth", "Charlie Jr."]

I'd rewrite this paragraph as follows:

The x in the loop represents each attribute in the person object. Each x will be one of the attributes such as person["name"], person["age"], etc.
mszczepaniak (4) [Avatar] Offline
Re: Section 1.3.6
I reread this a few more times and realize that your original explanation is probably fine. "... using the person["name"] syntax..."

I got tripped up on the distinction between the name of the attribute and the "name" attribute itself. Sorry.