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'length' function for lists and cons cells?
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From: |
Thorsten Jolitz |
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Subject: |
'length' function for lists and cons cells? |
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Date: |
Thu, 21 Mar 2013 19:21:29 +0100 |
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User-agent: |
Gnus/5.130002 (Ma Gnus v0.2) Emacs/24.2 (gnu/linux) |
Hi List,
which function could I use when I map an alist e.g. with dolist, that
contains both types of associations as shown below: cons cells, or lists
with 3 or more elements?
'length' doesn't work on cons cells:
,------------------------
| (length '("a" "b" "c"))
| 3
`------------------------
,--------------------------------------------------------------
| (length '("a" . "c"))
|
| Debugger entered--Lisp error: (wrong-type-argument listp "c")
| length(("a" . "c"))
`--------------------------------------------------------------
--
cheers,
Thorsten