Adding columns dynamically based on availability

Hi, 

I have a situation where I need to add columns dynamically if the column is not available. Say for e.g. I have 4 predefined columns [A, B, C, D] and I have a table "Data" with columns [Sno, Date, B, D]. 

Now I want to iterate to check if [A,B,C,D] all predefined columns are available in table "Data", I am trying to use accumulate to find out if it can be achieved in the below fashion or is there a better way to solve this issue. 

= List.Accumulate({"A","B","C","D"}, "Data"}, Table.ColumnNames(#"Data"),
(original, current) =>

if !(Table.Hascolumns[current],original) then  

     Table.AddColumn(original,current[], each [current]))