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FilledSmallSquareLevel[expr, levelspec] gives a list of all subexpressions of expr on levels specified by levelspec.

FilledSmallSquareLevel[expr, levelspec, f] applies f to the list of subexpressions.

FilledSmallSquareLevel uses the standard level specification described in Section A.3.6.

FilledSmallSquareLevel[expr, -1] gives a list of all "atomic" objects in expr.

FilledSmallSquareLevel traverses expressions in depth-first order, so that the subexpressions in the final list are ordered lexicographically by their indices.

FilledSmallSquare See The Mathematica Book: Section 2.1.7.

FilledSmallSquare See also: Apply, Map, Scan.

Further Examples