Speaking of Filter and Match...

Roger Guay irog at mac.com
Sun Mar 13 16:16:17 EDT 2022

Thank you Jacqueline, Alex and Terry. Very interesting new (for me) methods that I would never have come up with on my own. 


> On Mar 13, 2022, at 1:05 PM, J. Landman Gay via use-livecode <use-livecode at lists.runrev.com> wrote:
> On 3/12/22 8:54 PM, Roger Guay via use-livecode wrote:
>> I have a field with about a thousand lines with many duplicate lines, and I want to delete the duplicates. Seems like this should be simple but I am running around in circles. Can anyone help me with this?
> Making the list into an array is the easiest way but as mentioned, it will destroy the original order. If the order is important then you can restore it with a custom sort function. Here's my test handlers:
> on mouseUp
>  put fld 1 into tData -- we keep this as a reference to the original order
>  put tData into tTrimmedData -- this one will change
>  split tTrimmedData by cr as set -- removes duplicates
>  put keys(tTrimmedData) into tTrimmedData -- convert to a text list
>  sort tTrimmedData numeric by origOrder(each,tData)
>  put tTrimmedData into fld 1
> end mouseUp
> function origOrder pWord, @pData
>  set wholematches to true -- may not matter, depends on the data
>  return lineoffset(pWord, pData)
> end origOrder
> Field 1 contains lines in random order with duplicates.
> -- 
> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
> HyperActive Software           |     http://www.hyperactivesw.com
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