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Make 'mapconcat' argument 'separator' optional

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* src/fns.c (Fmapconcat): Make third 'separator' argument
optional.  (Bug#50965)
* doc/lispref/functions.texi (Mapping Functions): Update
documentation for above change.
* test/src/fns-tests.el (fns-tests-mapconcat): New test.

* doc/misc/cl.texi (Obsolete Setf Customization): Don't use third
mapconcat argument in example.
* lisp/emacs-lisp/subr-x.el (string-join): Doc fix.
This commit is contained in:
Stefan Kangas 2021-10-05 15:36:31 +02:00
parent 4bf532ee82
commit d652efcd08
6 changed files with 35 additions and 9 deletions
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8
src/fns.c
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@ -2852,12 +2852,16 @@ mapcar1 (EMACS_INT leni, Lisp_Object *vals, Lisp_Object fn, Lisp_Object seq)
return leni;
}
DEFUN ("mapconcat", Fmapconcat, Smapconcat, 3, 3, 0,
DEFUN ("mapconcat", Fmapconcat, Smapconcat, 2, 3, 0,
doc: /* Apply FUNCTION to each element of SEQUENCE, and concat the results as strings.
In between each pair of results, stick in SEPARATOR. Thus, " " as
SEPARATOR results in spaces between the values returned by FUNCTION.
SEQUENCE may be a list, a vector, a bool-vector, or a string.
SEPARATOR must be a string, a vector, or a list of characters.
Optional argument SEPARATOR must be a string, a vector, or a list of
characters; nil stands for the empty string.
FUNCTION must be a function of one argument, and must return a value
that is a sequence of characters: either a string, or a vector or
list of numbers that are valid character codepoints. */)