Rearranging Code: ->>
The ->> macro threads an expression x through a variable number of forms. First, x is inserted as the last item in the first form, making a list of it if it is not a list already. Then the first form is inserted as the last item in the second form, making a list of that form if necessary. This process continues for all the forms. Using ->> can sometimes make your code more readable.
(= (__ (map inc (take 3 (drop 2 [2 5 4 1 3 6])))) (->> [2 5 4 1 3 6] (drop 2) (take 3) (map inc) (__)) 11)