macro boot.janet on line 1074, column 1 (-?> x & forms) Short circuit threading macro. Inserts x as the second value in the first form in forms, and inserts the modified first form into the second form in the same manner, and so on. The pipeline will return nil if an intermediate value is nil. Useful for expressing pipelines of data.
(defn return-nil [x] nil) (-?> 1 inc) # -> 2 (-?> 1 inc inc) # -> 3 (-?> 1 inc inc return-nil) # -> nil (-?> 1 inc inc return-nil inc) # -> nil