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### 4.2 Predicates for Strings

For more information about general sequence and array predicates, see Sequences Arrays Vectors, and Arrays.

Function: stringp object

  This function returns `t` if object is a string, `nil` otherwise.

Function: string-or-null-p object

  This function returns `t` if object is a string or `nil`. It returns `nil` otherwise.

Function: char-or-string-p object

  This function returns `t` if object is a string or a character (i.e., an integer), `nil` otherwise.