aggregateResult method
- T? aggregate,
- T? nextResult
Aggregates the results of visiting multiple children of a node. After
either all children are visited or {@link #shouldVisitNextChild} returns
false, the aggregate value is returned as the result of
{@link #visitChildren}.
The default implementation returns [nextResult], meaning {@link #visitChildren} will return the result of the last child visited (or return the initial value if the node has no children).
@param aggregate The previous aggregate value. In the default
implementation, the aggregate value is initialized to
{@link #defaultResult}, which is passed as the aggregate argument
to this method after the first child node is visited.
@param nextResult The result of the immediately preceeding call to visit
a child node.
@return The updated aggregate result.
Implementation
T? aggregateResult(T? aggregate, T? nextResult) => nextResult;