(
#comment
(let mr_source (DataSource 'yt 'plato))
(let x (Read! world mr_source (Key '('table (String 'Input))) '('key 'subkey 'value) '()))
(let world (Left! x))
(let table1 (Right! x))
(let table1map (Map table1 (lambda '(item) (block '(
   (let x (Double '1.2))
   (let y (Double '3))
   (let newValue (String '" => "))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (+ x y)))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (- x y)))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (* x y)))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (/ x y)))))
   
   (let x (Float '0.1))
   (let y (Float '-2.2))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (+ x y)))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (- x y)))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (* x y)))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (/ x y)))))

   (let newValue (Concat newValue (Concat (String '" ") (ToString (Coalesce (FromString (String '1.23) 'Float) (Float '0.0))))))
   
   (let s (Struct))
   (let s (AddMember s 'key (Member item 'key)))
   (let s (AddMember s 'subkey (Member item 'subkey)))
   (let s (AddMember s 'value newValue))
   (return s)
)))))
(let mr_sink (DataSink 'yt (quote plato)))
(let world (Write! world mr_sink (Key '('table (String 'Output))) table1map '('('mode 'append))))
(let world (Commit! world mr_sink))
(return world)
)