is Node At As
Returns true if the child at index is a node of type N.
Return
true if the child is a node of type N, false otherwise
Parameters
N
The expected node type
index
The zero-based index of the child
Returns true if the child at index is a node of type N that satisfies the predicate.
Return
true if the child is a node of type N and satisfies the predicate, false otherwise
Parameters
N
The expected node type
index
The zero-based index of the child
predicate
A function that tests the node