How to get certain object based on Max value.

Also to mention this should not be the solution for just these 2 objects as I can have a list of N objects. So the one with the highest Max_days should be returned. Thx

You can use todatasubset() to sort lists of dictionaries.

Agree with Stefan, utilize todatasubset() and sort by Max_days, return the top item only:

a!localVariables(
  local!data: {
    {id: 1, Max_days: 54, Max_amount: 36671},
    {id: 2, Max_days: 1317, Max_amount: 15158},
    {id: 3, Max_days: 99, Max_amount: 12545},
    {id: 4, Max_days: 200, Max_amount: 54321}
  },
  
  index(
    todatasubset(local!data,a!pagingInfo(1,-1,a!sortInfo("Max_days",false))).data,
    1,
    null
  )
)

Agree with Stefan, utilize todatasubset() and sort by Max_days, return the top item only:

a!localVariables(
  local!data: {
    {id: 1, Max_days: 54, Max_amount: 36671},
    {id: 2, Max_days: 1317, Max_amount: 15158},
    {id: 3, Max_days: 99, Max_amount: 12545},
    {id: 4, Max_days: 200, Max_amount: 54321}
  },
  
  index(
    todatasubset(local!data,a!pagingInfo(1,-1,a!sortInfo("Max_days",false))).data,
    1,
    null
  )
)

I agree with Stefan and Chris! You can even give batchSize as 1 in which case the need for indexing will also be eliminated.

Ah yes, batchSize -1 is definitely not necessary, "1" will work correctly there.  I would still recommend indexing however as to return a single dictionary vs a list of dictionary with 1 item, just incase :)