Compare each item one by one in two arrays

RE: Compare each item one by one in two arrays

nikolas — Thu, 18 Nov 2021 09:25:36 GMT

Wow, so simple. I was definitely overcomplicating it. Thank you!!!!

RE: Compare each item one by one in two arrays

Chris — Wed, 17 Nov 2021 20:33:38 GMT

Few ways to do this, but Stefan's solution is by far the most efficient. However I might utilize a!foreach() with checking the max() length of either array to ensure all scenarios will be covered, and allow for scalability (say you want to ignore null values in the future). If we can spare the extra ~1.5 ms:

a!localVariables(
  local!dtmdata: {9, 9, 33, 33},
  local!databaseData: {9, 33, 33, 33},

  a!forEach(
    items: 1+enumerate(max(count(local!dtmdata),count(local!databaseData))),
    expression: if(
      index(local!dtmdata,fv!index,null)=index(local!databaseData,fv!index,null),
      {},
      fv!index
    )
  )
)

RE: Compare each item one by one in two arrays

Mike Schmitt — Wed, 17 Nov 2021 19:09:28 GMT

...

a!localVariables(

  local!dtmdata: { 9, 9, 33, 33 },
  local!databaseData: { 9, 33, 33, 33 },
  
  local!notAtIndex: a!forEach(
    items: local!dtmdata,
    expression: if(
      /* using index() here as it will allow the logic to run without breaking even if arrays are different lengths */
      index(local!databaseData, fv!index, null()) = fv!item,
      {},
      fv!index
    )
  ),
  
  local!notAtIndex
)

RE: Compare each item one by one in two arrays

Stefan Helzle — Wed, 17 Nov 2021 19:06:55 GMT

a!localVariables(
  local!dtmdata: {9, 9, 33, 33},
  local!databaseData: {9, 33, 33, 33},
  where(local!dtmdata <> local!databaseData)
)