(guile.info.gz) List Selection
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22.2.4 List Selection
---------------------
These procedures are used to get some information about a list, or to
retrieve one or more elements of a list.
-- Scheme Procedure: length lst
-- C Function: scm_length (lst)
Return the number of elements in list LST.
-- Scheme Procedure: last-pair lst
-- C Function: scm_last_pair (lst)
Return a pointer to the last pair in LST, signalling an error if
LST is circular.
-- Scheme Procedure: list-ref list k
-- C Function: scm_list_ref (list, k)
Return the Kth element from LIST.
-- Scheme Procedure: list-tail lst k
-- Scheme Procedure: list-cdr-ref lst k
-- C Function: scm_list_tail (lst, k)
Return the "tail" of LST beginning with its Kth element. The
first element of the list is considered to be element 0.
`list-tail' and `list-cdr-ref' are identical. It may help to
think of `list-cdr-ref' as accessing the Kth cdr of the list, or
returning the results of cdring K times down LST.
-- Scheme Procedure: list-head lst k
-- C Function: scm_list_head (lst, k)
Copy the first K elements from LST into a new list, and return it.
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