a wrapped children operator that functions as a children data operator
When creating a Hierarchy with a children operator, the corresponding Hierarchy#childrenData will be wrapped in this. This version returns undefined for all link data.
get children data from a node
the datum to get children of
the index with which the data was encountered
childrenData - all the children data of this node, or undefined if there are no children
the wrapped children operator
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a wrapped children operator that functions as a children data operator
When creating a Hierarchy with a children operator, the corresponding Hierarchy#childrenData will be wrapped in this. This version returns undefined for all link data.