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based on an earlier version of the Wolfram Language.
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CasesDimensions

Length

FilledSmallSquareLength[expr] gives the number of elements in expr.

FilledSmallSquare See The Mathematica Book: Section 1.4.8, Section 1.8.3 and Section 2.1.5.

FilledSmallSquareLength[expr] returns 0 whenever AtomQ[expr] is True.

FilledSmallSquare See also: LeafCount, ByteCount, Depth.

Further Examples

CasesDimensions