Objects and arrays...

Reading the d3 book from O'Reilly, I learned something important today.

This was the difference between objects and arrays.

Arrays have square brackets and are referred to with numbers.
For example
var number = [5,10,15,20,25];
numbers[0]  // returns 5
numbers[4] // returns 25

In contrast

Objects
   Well it seems that almost anything can be a JavaScript object but...
   Described in curly brackets "{"

Example:
var fruit = { kind:"grape", color:"red", quantity:12, tasty=true};
to reference this use the dot notation
fruit.kind // returns "grape"
fruit.color // returns "red"

You can have arrays of objects or objects of arrays etc....

In my rendering of CD40 in JSON, I had an array of objects.
IN that case I ended up with
fruits[0].quantity
type of notation.

It's possible to render this in an array of arrays too.

Will work just as well :-)

To describe the positions, use numbers.

This should/might make life easier.