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list slice (equivalent of myList[start:stop])

caver456

Is there an easy way to take a list slice in skill?  Seems like a core functionality but I'm not finding it in the docs.  Something like:

a='("a" "b" "c" "d")

a[1:2] --> ("b" "c")   (or if it were python-like just ("b"))

a[:2] --> ("a" "b" "c")

a[2:] --> ("c" "d")

Parents
  • Andrew Beckett

    It's an unusual thing to do in SKILL, because lists are sequential and so this implies sort-of treating them like arrays. So usually you don't do operate on defined position numbers within the list. 

    However, it's easy enough to write a function to do this:

    procedure(CCFslice(l @key (first 0) last)
    let(((pos 0))
        setof(elem l prog1(pos>=first && (!last || pos<=last) pos++))
    )
)

    Then this can be used:

    > CCFslice(a ?first 1 ?last 2)
    ("b" "c")
    > CCFslice(a ?last 2)
    ("a" "b" "c")
    > CCFslice(a ?first 2)
    ("c" "d")

    Of course, you could alter the interface to the function to be as you like.

    Andrew.

Reply
  • Andrew Beckett

    It's an unusual thing to do in SKILL, because lists are sequential and so this implies sort-of treating them like arrays. So usually you don't do operate on defined position numbers within the list. 

    However, it's easy enough to write a function to do this:

    procedure(CCFslice(l @key (first 0) last)
    let(((pos 0))
        setof(elem l prog1(pos>=first && (!last || pos<=last) pos++))
    )
)

    Then this can be used:

    > CCFslice(a ?first 1 ?last 2)
    ("b" "c")
    > CCFslice(a ?last 2)
    ("a" "b" "c")
    > CCFslice(a ?first 2)
    ("c" "d")

    Of course, you could alter the interface to the function to be as you like.

    Andrew.

Children
  • caver456
    in reply to Andrew Beckett

    Thanks, yeah maybe there's a better way to accomplish the specific goal here - will post a separate thread since it's a separate question.  Still this slicability may come in handy some day.

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