Merge function usage with dynamic list

RE: Merge function usage with dynamic list

tushark6475 — Tue, 17 Oct 2023 05:16:23 GMT

I guess, there is always some space for optimization. 😉

RE: Merge function usage with dynamic list

Stefan Helzle — Mon, 16 Oct 2023 14:31:20 GMT

A small optimization

a!localVariables(
  local!a: {
    { a: 1, b: { 1, 2, 3 } },
    { a: 2, b: { "asdf", 5, 6 } },
    { a: 1, b: { 7, 8 } }
  },
  a!forEach(
    items: enumerate(count(local!a)),
    expression: a!localVariables(
      local!index: fv!index,
      a!forEach(
        items: local!a.b,
        expression: index(fv!item, local!index, "")
      )
    )
  )
)

RE: Merge function usage with dynamic list

Peter Lewis — Mon, 16 Oct 2023 14:16:20 GMT

Yeah this looks like a good outcome! For what it's worth, since a!forEach() came out, I have entirely stopped using the merge() function. You can generally achieve anything you needed to from merge() with a!forEach(), and a!forEach() is much easier to debug or set up complex logic.

RE: Merge function usage with dynamic list

Stefan Helzle — Mon, 16 Oct 2023 13:45:46 GMT

merge() does not work here as it requires the individual lists to be separate parameters instead of a list of lists.

RE: Merge function usage with dynamic list

tushark6475 — Mon, 16 Oct 2023 12:41:27 GMT

stackoverflow.com/.../how-to-ask

RE: Merge function usage with dynamic list

tushark6475 — Mon, 16 Oct 2023 12:32:26 GMT

In that case, this will work for you -

a!localVariables(
  local!a: {
    { a: 1, b: { 1, 2, 3 } },
    { a: 2, b: { "asdf", 5, 6 } },
    { a: 1, b: { 7, 8 } }
  },
  a!forEach(
    items: enumerate(count(local!a.b)) + 1,
    expression: a!localVariables(
      local!index: fv!item,
      a!forEach(
        items: local!a.b,
        expression: if(
          local!index > count(fv!item),
          "",
          fv!item[local!index]
        )
      )
    )
  )
)

Note - Here I am assuming that you require the output in the "List of Variant" type. If you want output as a "list of text" or only 3 values then wrap the inner forEach() in the joinArray() with a separator ",".

RE: Merge function usage with dynamic list

TJ — Mon, 16 Oct 2023 12:14:40 GMT

Hi Tushar,

Thank you for your response. However,

I am looking for the output {{1, "asdf", 7}, {2, 5, 8}, {3, 6, null}} and not the result of foreach

RE: Merge function usage with dynamic list

TJ — Mon, 16 Oct 2023 12:14:03 GMT

Hi Stefan,

Apologies for the misunderstanding, I am looking for the following merged output but using the variable local!a.b and not the values.

{{1, "asdf", 7}, {2, 5, 8}, {3, 6, null}}

So, from the original query;

merge({ 1, 2, 3 }, { "asdf", 5, 6 }, { 7, 8 }) works as the literal values results in desired output

however, merge(local!a.b[1], local!a.b[2], local!a.b[3]), does not work with the exact same values used in list of variants

RE: Merge function usage with dynamic list

tushark6475 — Mon, 16 Oct 2023 07:21:02 GMT

I guess, this is you are looking for -

a!localVariables(
  local!a: {
    { a: 1, b: { 1, 2, 3 } },
    { a: 2, b: { "asdf", 5, 6 } },
    { a: 1, b: { 7, 8 } }
  },
  a!forEach(
    items: local!a,
    expression: fv!item.b
  )
)

RE: Merge function usage with dynamic list

Stefan Helzle — Mon, 16 Oct 2023 06:23:00 GMT

I still do not have a clear idea what the final output of this operation should look like. Your input data structure is:

{
{ a: 1, b: { 1, 2, 3 } },
{ a: 2, b: { "asdf", 5, 6 } },
{ a: 1, b: { 7, 8 } }
}

Now, what is the output?

RE: Merge function usage with dynamic list

TJ — Mon, 16 Oct 2023 03:00:20 GMT

Hi Stefan,

The intended outcome is merge({ 1, 2, 3 }, { "asdf", 5, 6 }, { 7, 8 }), somehow using local!a.b variable.

The use case is to build a table with columns local!a.a and dynamic rows based on combination of local!a.b

RE: Merge function usage with dynamic list

Stefan Helzle — Sun, 15 Oct 2023 13:42:21 GMT

What is the intended outcome? And, why do you "need" to use the merge function?