List Commands Library for 50g

[DavidM]

(08-22-2017 11:48 PM)John Keith Wrote:  The fastest program that I know for the first example is REL (Remove ELement) from One-Minute Marvels:

Code:

\<< SWAP OBJ\-> 2. + DUP ROLL OVER SWAP - ROLL DROP 3. - \->LIST \>>

To delete multiple objects you can convert the list to a string and use SREPL but that method can be slow for large lists due to the time required for OBJ\-> to convert the modified string back into a list.

John

So may I assume that you would be in support of specialized commands in the ListExt library to delete multiple instances of indexed elements?

To all, some considerations to ponder...

This would seem like a good candidate for a command with an overloaded argument scenario. The first would be:

2: { list of objects }
1: number (index of element to delete)

A second option:
2: { list of objects }
1: { list of indices to delete }

Other considerations:

What is the appropriate result for the following scenarios?

• Index list is empty
• Index list contains a 0
• Index list contains non-numeric elements
• Index list contains negative/fractional numbers
• Index list contains numbers greater than the number of elements in SL2 list
  

What would be an appropriate name for such a command?

Then there's mostly the same considerations for a command that would remove a list of matching elements (as opposed to indexed).