Frustrated using DataFrames

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I also want to stress that with the @aside macro, you can do this kind of loop inside the @chain block. This is something you can’t do in dplyr, and is probably the cause of some of it’s more complicated all-in-one-call syntaxes.

julia> using DataFramesMeta;

julia> df = DataFrame(rand(20, 10), :auto);

julia> @chain df begin 
           @rtransform :y = :x1 + :x2
           @aside begin 
               nms = names(df, Between(:x5, :x9))
               for n in nms
                   @rtransform! _ $n = $n + 100
               end
               _
           end
           @rtransform :z = :x8 + :x9
       end
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