error_example2.clj

(ns error-example)

(declare ^{:dynamic true} handle-error)

(defn calculation
  [x]
  (if (= x 5)
    (handle-error x)
    x))

(map (fn [x]
       (binding [handle-error (fn [e] nil)]
         (calculation x)))
     (range 1 20))
; (1 2 3 4 nil 6 7 8 9 10 11 12 13 14 15 16 17 18 19)