List Commands Library for 50g

[John Keith]

(01-06-2018 07:29 PM)DavidM Wrote:  I was thinking that's what GoferList's Insert did, but after looking at it more closely, Insert is more like an "append". That's an odd misnomer, given that "+" is much easier to enter into a program (and it essentially does the same thing as far as I can see). Insert does at least call AppendList, which might perform better than >TCOMP in some cases (which is what + does).

What GoferLists' Insert command actually does is to append an object to the list if and only if the list does not already contain the object. Sort of like

Code:

DUP2 POS { DROP } { + } IFTE

or perhaps + LDDUP or + Nub

I can see a benefit to either (or both!) interpretations of LINSR / Insert. What Gilles is proposing is easy enough in UserRPL but a fast Library command would of course be preferable.

John