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->



    macro
    boot.janet on line 1174, column 1

    (-> x & forms)

    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. Useful for expressing pipelines of 
    data.

See also:->>5 examplesSign in to add an example

(-> "X"
    (string "a" "b")
    (string "c" "d")
    (string "e" "f"))  # => "Xabcdef"

uvtcPlayground

(->
  {:a [1 2 3] :b [4 5 6]}
  (get :a)
  (sum)
  (string " is the result"))
# -> "6 is the result"

# same as:
(string (sum (get {:a [1 2 3] :b [4 5 6]} :a))" is the result")

felixrPlayground

(->  1 (< 2))   # -> true
(->> 1 (< 2))   # -> false

cellularmitosisPlayground

(-> 1 (+ 2) (+ 3))  # -> 6

cellularmitosisPlayground

(defn inc [x] (+ x 1))
(defn inv [x] (* x -1))
(defn sq  [x] (* x x))

(-> 2 inc)             # -> 3
(-> 2 inc inc)         # -> 4
(-> 2 inc inc inv)     # -> -4
(-> 2 inc inc inv sq)  # -> 16

cellularmitosisPlayground