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unexpected sort behavior

amac

Hello, have you ever experienced a sort function that "eats" part of a list?

m=list(list("a" "MM") list("p" "PP" ))
sort(m lambda((a b) alphalessp(cadr(b) cadr(a))))

If executed from CIW it correctly produces:

m
(("a" "MM")
    ("p" "PP")
)

If executed within a .il file it gives:

m
(("a" "MM"))

What is happening?

  • Hi,

    sort is a destructive function.

    It actually modifies the pointers inside your list, you should always be careful while using it : 

    It's OK, if you sort a list that is generated on the fly
    (sort (geGetEditCellView)->instances (lambda (i0 i1) (alphalessp i0->name i1->name))))

    Otherwise, you have two solutions : 

    1. Re-assign the sorted list : 
    m = list(list("a" "MM") list("p" "PP" ))
    m = sort(m lambda((a b) alphalessp(cadr(b) cadr(a))))

    2. Copy the list before sort : 
    m = list(list("a" "MM") list("p" "PP" ))
    sort(copy(m) lambda((a b) alphalessp(cadr(b) cadr(a))))

    Cheers

    Aurélien

  • in reply to AurelBuche

    Indeed assigning the result to m itself solves the issue.

    Thanks a lot!

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