Unicon extends delete(x1, x2, ...) to allow deletion of items from lists.
According to the Unicon book, p. 312, ‘If x1 is a list... elements xi are
integer indices of the element to be deleted.’
Negative indices into lists are allowed in other contexts, e.g. if L is a
list, L[-1] returns the same element as L[*L]. But negative indices do not
work with delete(). The following code produces the output listed below:
procedure main()
write(&version)
write()
H := []
every put(H, 1 to 10)
write("Size of H is ", *H)
delete(H, -1)
write("delete(H, -1)")
write("Size of H is ", *H)
delete(H, *H)
write("delete(H, *H)")
write("Size of H is ", *H)
end
Unicon Version 12.1. April 13, 2013
Size of H is 10
delete(H, -1)
Size of H is 10
delete(H, *H)
Size of H is 9
I would expect the statement
delete(H, -1)
to delete the last element of H. But it does nothing at all.
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