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tanujd6440
January 31, 2025
Solved

Reverse a String without using reverse function

  • January 31, 2025
  • 3 replies
  • 0 views

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)
      )
    )
  )


Best answer by stefanhelzle0001

No recursion required

ri!text[len(ri!text) - enumerate(len(ri!text))]

3 replies

stefanhelzle0001
stefanhelzle0001Answer
January 31, 2025

No recursion required

ri!text[len(ri!text) - enumerate(len(ri!text))]

    T
    tanujd6440Author
    January 31, 2025

    Thanks, I got to learn new way of problem solving

    mikes0011
    mikes0011
    Brainy
    January 31, 2025

    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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