Cross operator (for data stack)? about d3

[mbostock]

The min and max operators should probably also be included with this module.

[mbostock]

I've added the d3.nest operator. Still considering cross.

[mbostock]

You can obviate the need for a cross operator by using recursive evaluation, via each. The nice thing is it allows access to parent data, as with Protovis, and avoids flattening (embedding) the parent data into child data. The downside is that it could make later updates more difficult, because if you reselect the children you'll be outside of the closure and so won't have access to the parent data…