diff options
Diffstat (limited to 'doc/lispref/functions.texi')
| -rw-r--r-- | doc/lispref/functions.texi | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/doc/lispref/functions.texi b/doc/lispref/functions.texi index cb14d02d449..8f98ac935c9 100644 --- a/doc/lispref/functions.texi +++ b/doc/lispref/functions.texi @@ -969,14 +969,14 @@ side-effects only---the values it returns are ignored, not collected into a list. @code{mapc} always returns @var{sequence}. @end defun -@defun mapconcat function sequence separator +@defun mapconcat function sequence &optional separator @code{mapconcat} applies @var{function} to each element of @var{sequence}; the results, which must be sequences of characters (strings, vectors, or lists), are concatenated into a single string return value. Between each pair of result sequences, @code{mapconcat} inserts the characters from @var{separator}, which also must be a -string, or a vector or list of characters. @xref{Sequences Arrays -Vectors}. +string, or a vector or list of characters; a @code{nil} value is +treated as the empty string. @xref{Sequences Arrays Vectors}. The argument @var{function} must be a function that can take one argument and returns a sequence of characters: a string, a vector, or @@ -994,8 +994,7 @@ string. @group (mapconcat (lambda (x) (format "%c" (1+ x))) - "HAL-8000" - "") + "HAL-8000") @result{} "IBM.9111" @end group @end example |