Doubly-linked list/Element definition: Difference between revisions

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=={{header|REXX}}==
=={{header|REXX}}==
REXX doesn't have linked lists, as there are no pointers (or handles).
REXX doesn't have linked lists, as there are no pointers (or handles).
⚫
<br>However, linked lists can be simulated with lists in REXX.
<br>

⚫
However, linked lists can be simulated with lists in REXX.
╔═════════════════════════════════════════════════════════════════════════╗
┌────────────────────────────────────────────────────────────────────┐
┌─┘ Functions of the List Manager └─┐
║ ☼☼☼☼☼☼☼☼☼☼☼ Functions of the List Manager ☼☼☼☼☼☼☼☼☼☼☼ ║
│ │
║ @init ─── initializes the List. ║
│ @init ─── initializes the List. │
║ ║
│ │
║ @size ─── returns the size of the List [could be a 0 (zero)]. ║
⚫
║ ║
│ @size ─── returns the size of the List [could be 0 (zero)]. │
│ │
║ @show ─── shows (displays) the complete List. ║
│ @show ─── shows (displays) the complete List. │
║ @show k,1 ─── shows (displays) the Kth item. ║
⚫
║ @show k,m ─── shows (displays) M items, starting with Kth item. ║
│ @show k,1 ─── shows (displays) the Kth item. │
│ @show k,m ─── shows (displays) M items, starting with Kth item. │
║ @show ,,─1 ─── shows (displays) the complete List backwards. ║
║ ║
│ @show ,,─1 ─── shows (displays) the complete List backwards. │
│ │
║ @get k ─── returns the Kth item. ║
│ @get k ─── returns the Kth item. │
║ @get k,m ─── returns the M items starting with the Kth item. ║
║ ║
⚫
│ @get k,m ─── returns the M items starting with the Kth item. │
│ │
║ @put x ─── adds the X items to the end (tail) of the List. ║
│ @put x ─── adds the X items to the end (tail) of the List. │
║ @put x,0 ─── adds the X items to the start (head) of the List. ║
│ @put x,0 ─── adds the X items to the start (head) of the List. │
║ @put x,k ─── adds the X items to before of the Kth item. ║
║ ║
│ @put x,k ─── adds the X items to before of the Kth item. │
│ │
║ @del k ─── deletes the item K. ║
│ @del k ─── deletes the item K. │
║ @del k,m ─── deletes the M items starting with item K. ║
╚═════════════════════════════════════════════════════════════════════════╝
│ @del k,m ─── deletes the M items starting with item K. │
⚫
└─┐ ┌─┘
└────────────────────────────────────────────────────────────────────┘
<lang rexx>/*REXX program that implements various List Manager functions. */
<lang rexx>/*REXX program that implements various List Manager functions. */
call sy 'initializing the list.' ; call @init
call sy 'initializing the list.' ; call @init
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