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Fastest way to merge two lists without duplicates

zmleitao

When developing SKILL scripts I find the need to join or merge two lists, while avoiding duplicate items.

E.g.:

list1 = '(a b c) 

list2 = '(a d c )

merge_func(list1, list2) -> '(a b c d )

Is there a fast/native way to do it in SKILL that is not the obvious iterative solution?

Parents

  • If order doesn't matter, you can probably do it even faster than Andrew's:

    > list1 = '(a b c)
(a b c)
> list2 = '(a d c)
(a d c)
> myTable = makeTable("temp" nil)
table:temp
> foreach(element (append list1 list2) myTable[element] = t)
    (a b c a d
        c
    )
    > myTable->?
(b c a d)
Reply

  • If order doesn't matter, you can probably do it even faster than Andrew's:

    > list1 = '(a b c)
(a b c)
> list2 = '(a d c)
(a d c)
> myTable = makeTable("temp" nil)
table:temp
> foreach(element (append list1 list2) myTable[element] = t)
    (a b c a d
        c
    )
    > myTable->?
(b c a d)
Children
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