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gives True if the head of expr is List, and False otherwise.
ListQ gives True when the head of an expression is List:
ListQ gives False when the head of an expression is not List:
ListQ gives False on other array representations:
ListQ is equivalent to MatchQ[#,_List]&:
VectorQ returns True for other 1D array representations:
ListQ[list] is not affected by deeper levels of List:
VectorQ[list] does not accept deeper levels of List:
List VectorQ MatrixQ ArrayQ