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VectorQ

Tests whether an expression is a flat (non-nested) list.

$ wo 'VectorQ[{1, 2, 3}]'
True

$ wo 'VectorQ[{{1, 2}, {3, 4}}]'
False

The two-argument form additionally requires every element to satisfy a test.

$ wo 'VectorQ[{1, 2, x}, NumberQ]'
False

$ wo 'VectorQ[{1, 2, 3}, Positive]'
True