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Guile Reference Manual

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