Programming puzzles: processing lists!

[DavidM]

Regarding #21:

OK, this is clearly cheating, but I just ran across this function reference while looking at some SysRPL list-handling routines. It turns out that there's a built-in function ("^COMPRIMext") for removing duplicates in a list, but it's only accessible via FLASHEVAL from UserRPL on the 50g:

Code:

\<< #2FD006 FLASHEVAL \>>

It looks like it simply explodes the list and then rebuilds it using "^AppendList", which is itself another SysRPL command that adds an element to a list but only if it isn't already there. The nice thing about it is that it is essentially a Saturn code object with a wrapper, so it should be relatively fast.