Get duplicates from array

Question

How to get the duplicates from an array: 
 i/p:{1,2,2,3,3} o/p:{2,3}

Harshitha Mangamuri · Answer

Hi, Please try to use this 
 a!localVariables(
 local!a:{1,2,2,3,3},
 a!flatten(a!forEach(
 items: union(local!a,local!a),
 expression: if(
 length(wherecontains(fv!item,local!a))>1,
 fv!item,
 {}
 )
 ))
)

jamesm4933 · Answer

This seems to work, too. 
 a!localVariables(
 local!input: { 1, 2, 2, 3, 3 },
 local!output: index(local!input, a!forEach(union(local!input, local!input), index(wherecontains(fv!item, local!input), 2, {}))),
 local!output
)

Get duplicates from array

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