Remove Duplicates Letters

Question

How to remove duplicate letters from the string without changing case of letters 
 input "Deleted" 
 output "Delt"

Stefan Helzle · Answer

A shorter version. I check each character whether it already is part of the substring before it. 
 a!localVariables(
 local!text: "Deleted",
 joinarray(
 a!foreach(
 items: enumerate(len(local!text)),
 expression: if(
 a!isInText(left(local!text, fv!item), local!text[fv!index]),
 "",
 local!text[fv!index]
 )
 ),
 ""
 )
)

Harsha Sharma · Answer

With the use of functions and loops this can be achieved. First you need to split the text into a character array. Then remove the duplicates from the character array. Result will have unique characters - uppercase and lowercase will be in this array as they are unique still! Lastly we identify/reject the duplicates doing a case match and return the output as expected, in the same case and order as present in original text. 
 Below is a code with the solution for this interesting question. Hope it helps! 
 a!localVariables(
 local!text: "Deleted",
 local!charArray: a!foreach(
 enumerate(len(local!text)) + 1,
 local!text[fv!item]
 ),
 local!unique: union(local!charArray, local!charArray),
 joinarray(
 a!foreach(
 local!unique,
 if(
 fv!isFirst = 1,
 fv!item,
 if(
 length(
 wherecontains(lower(fv!item), lower(local!unique))
 ) > 1,
 {},
 fv!item
 )
 )
 )
 )
)

Remove Duplicates Letters

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