Programmatically adding multiple colums to a dataframe

General Usage
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3

Great questions. All the syntaxes within a chain block seem a bit clunky


julia> @chain df begin
           copy
           begin 
               for (ni, vi) in zip(n, v)
                   @rtransform! _ $ni = $vi
               end
               _
           end
       end
2×5 DataFrame
 Row │ a      b      a_1    a_2    a_3   
     │ Int64  Int64  Int64  Int64  Int64 
─────┼───────────────────────────────────
   1 │     1      3      1      3      1
   2 │     2      4      2      4      2

You can also leverage AsTable as follows

julia> @chain df begin
           @rtransform $AsTable = (; (Symbol(n[i]) => v[i] for i in eachindex(n))...)
       end
2×5 DataFrame
 Row │ a      b      a_1    a_2    a_3   
     │ Int64  Int64  Int64  Int64  Int64 
─────┼───────────────────────────────────
   1 │     1      3      1      2      3
   2 │     2      4      1      2      3

This is also very ugly. It looks like you can simplify things by using a Dict, though the order of columns might not be consistent, and performance will be hurt a little

julia> @chain df begin
           @rtransform $AsTable = Dict(n[i] => v[i] for i in eachindex(n))
       end
2×5 DataFrame
 Row │ a      b      a_1    a_2    a_3   
     │ Int64  Int64  Int64  Int64  Int64 
─────┼───────────────────────────────────
   1 │     1      3      1      2      3
   2 │     2      4      1      2      3