Remove Nth
| Function Syntax | (LM:RemoveNth <n> <l>) |
| Current Version | 1.0 |
| Arguments | ||
|---|---|---|
| Symbol | Type | Description |
| n | Integer | Zero based index of item to Remove |
| l | List | List from which to remove the item |
| Returns | ||
| Type | Description | |
| List | List with item at nth index removed | |
Program Description
This subfunction will return the supplied list with the item at index n removed.
Recursive Version
Select all
;;----------------------=={ Remove Nth }==--------------------;; ;; ;; ;; Removes the item at the nth index in a supplied list ;; ;;------------------------------------------------------------;; ;; Author: Lee Mac, Copyright © 2011 - www.lee-mac.com ;; ;;------------------------------------------------------------;; ;; Arguments: ;; ;; n - index of item to remove (zero based) ;; ;; l - list from which item is to be removed ;; ;;------------------------------------------------------------;; ;; Returns: List with item at index n removed ;; ;;------------------------------------------------------------;; (defun LM:RemoveNth ( n l ) (if (and l (< 0 n)) (cons (car l) (LM:RemoveNth (1- n) (cdr l))) (cdr l) ) )
Iterative Version
Select all
;;----------------------=={ Remove Nth }==--------------------;; ;; ;; ;; Removes the item at the nth index in a supplied list ;; ;;------------------------------------------------------------;; ;; Author: Lee Mac, Copyright © 2011 - www.lee-mac.com ;; ;;------------------------------------------------------------;; ;; Arguments: ;; ;; n - index of item to remove (zero based) ;; ;; l - list from which item is to be removed ;; ;;------------------------------------------------------------;; ;; Returns: List with item at index n removed ;; ;;------------------------------------------------------------;; (defun LM:RemoveNth ( n l / i ) (setq i -1) (vl-remove-if '(lambda ( x ) (= (setq i (1+ i)) n)) l) )
Example Function Call
_$ (LM:RemoveNth 3 '("A" "B" "C" "D" "E" "F")) ("A" "B" "C" "E" "F")