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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

  • Here's a solution optimized for small positive integers:

    procedure(merge_small_positive_integer_lists(@rest lists)
    let(
        (
            (vector makeVector(1024 nil))
            result
        )
        foreach(list lists
            foreach(element list
                vector[element] = t
            )
        )
        for(i 0 sub1(length(vector))
            when(vector[i]
                push(i result)
            )
        )
        result
    )
)

> merge_small_positive_integer_lists('(3 34 63 532 234 23 43) '(3 1 4 1 5 9 2 6 7 3))
(532 234 63 43 34
    23 9 7 6 5
    4 3 2 1
)

    You could do a similar thing with characters, storing them in a sparse vector of their ASCII codes.

Reply

  • Here's a solution optimized for small positive integers:

    procedure(merge_small_positive_integer_lists(@rest lists)
    let(
        (
            (vector makeVector(1024 nil))
            result
        )
        foreach(list lists
            foreach(element list
                vector[element] = t
            )
        )
        for(i 0 sub1(length(vector))
            when(vector[i]
                push(i result)
            )
        )
        result
    )
)

> merge_small_positive_integer_lists('(3 34 63 532 234 23 43) '(3 1 4 1 5 9 2 6 7 3))
(532 234 63 43 34
    23 9 7 6 5
    4 3 2 1
)

    You could do a similar thing with characters, storing them in a sparse vector of their ASCII codes.

Children
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