Not a one-liner, but I'd be wiling to guess that

  repeat for each line L in theData

      put item 2 of L into A1[item 1 of L]

      put item 1 of L into A2[item 2 of L]

  end repeat

will be as quick as any other method.

-- Alex.


On 27/10/2017 14:05, Tiemo Hollmann TB via use-livecode wrote:
Hello,

I have a delimiter separated list of two columns, first column is an ID,
second column a name.

I need two arrays of this list, one with the first column (ID) as the key
and one with the second column (name) as the key.

With split myArray by CR and ";" I get the first column (the ID) as the key.

Which is the most straight forward approach to get the second array with the
name from the second column as the key? I am sure there is a one liner,
without first shifting the columns of the list in a repeat loop.

Thanks

Tiemo

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