cljs.math/add-exact

function

since v1.11.50

Edit

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Source docstring:

Returns the sum of x and y, throws an exception on overflow. 

(defn ^number add-exact
  {:added "1.11.10"}
  [x y]
  (let [r (clojure.core/+ x y)]
    (if (or (> r js/Number.MAX_SAFE_INTEGER) (< r js/Number.MIN_SAFE_INTEGER))
      (throw (ex-info "Integer overflow" {:fn "add-exact"}))
      r)))

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