(guile.info.gz) String Predicates

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 21.4.2 String Predicates
 ------------------------
 
 The following procedures can be used to check whether a given string
 fulfills some specified property.
 
  -- Scheme Procedure: string? obj
  -- C Function: scm_string_p (obj)
      Return `#t' if OBJ is a string, else `#f'.
 
  -- Scheme Procedure: string-null? str
  -- C Function: scm_string_null_p (str)
      Return `#t' if STR's length is zero, and `#f' otherwise.
           (string-null? "")  => #t
           y                    => "foo"
           (string-null? y)     => #f
 

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