Reverse a String without using reverse function

Question

I'm unable to find where the mistake is in below code Reverse a string without reverse function: a!localVariables(
  local!result: ri!result,
  local!index: if(
    a!isNullOrEmpty(ri!index),
    length(ri!Input),
    ri!index
  ),
  if(
    ri!index < 1,
   ri!result,
    rule!T_Reversestring(
      ri!Input,
      local!index - 1,
      concat(
        local!result,
        index(ri!Input, local!index)
      )
    )
  )

stefanhelzle0001 · Accepted Answer

No recursion requiredri!text[len(ri!text) - enumerate(len(ri!text))]

mikes0011 · Answer

Stefan's elegant tiny answer got me thinking about what the "elegant but somewhat more verbose" answer might be. Once again we can rely on a!forEach() and the dataSubset sort. The advantage with this approach is it could potentially handle use cases with a little more nuance if needed.

a!localVariables(
  local!sortMap: a!forEach(
    enumerate(len(ri!text))+1,
    
    a!map(
      index: fv!item,
      currentLetter: ri!text[fv!item]
    )
  ),
  
  local!sortedSet: todatasubset(
    arrayToPage: local!sortMap,
    pagingConfiguration: a!pagingInfo(1, -1, a!sortInfo(field: "index", ascending: false()))
  ).data,
  
  concat(local!sortedSet.currentLetter)
)

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