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#elisp
Function: string-or-null-p object

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

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GNU Emacs Lisp Reference Manual: Predicates for Strings
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. <span>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. <span><body><html>


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