To find the greatest number in the array without max function

Hi romeoraja ,

Below one might be helpful.

a!localVariables(
  local!list: { 67, 80, 100, 102, 150 },
  local!map: a!forEach(
    items: local!list,
    expression: a!map(number: fv!item)
  ),
  index(
    index(
      index(
        todatasubset(
          arrayToPage: local!map,
          pagingConfiguration: a!pagingInfo(
            startIndex: 1,
            batchSize: length(local!list),
            sort: a!sortInfo(field: "number", ascending: false)
          )
        ),
        "data",
        {}
      ),
      "number",
      {}
    ),
    1,
    {}
  )
)

Hi romeoraja ,

Below one might be helpful.

a!localVariables(
  local!list: { 67, 80, 100, 102, 150 },
  local!map: a!forEach(
    items: local!list,
    expression: a!map(number: fv!item)
  ),
  index(
    index(
      index(
        todatasubset(
          arrayToPage: local!map,
          pagingConfiguration: a!pagingInfo(
            startIndex: 1,
            batchSize: length(local!list),
            sort: a!sortInfo(field: "number", ascending: false)
          )
        ),
        "data",
        {}
      ),
      "number",
      {}
    ),
    1,
    {}
  )
)

A couple of suggestions:

• You can simply set the batchSize to 1 in the pagingConfiguration. With this you can reduce the number of times you use the index function. 
• You can simply cast to an integer rather than getting the first element of the array, this removes another index.

a!localVariables(
  local!list: { 67, 80, 100, 102, 150 },
  local!map: a!forEach(
    items: local!list,
    expression: a!map(number: fv!item)
  ),
  local!dataSubset: todatasubset(
    arrayToPage: local!map,
    pagingConfiguration: a!pagingInfo(
      startIndex: 1,
      batchSize: 1,
      sort: a!sortInfo(field: "number", ascending: false)
    )
  ),
  cast(
    typeof(1),
    index(local!dataSubset.data, "number", null)
  )
)