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Venice, a sandboxed Lisp implemented in Java.

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;;;;   __    __         _
;;;;   \ \  / /__ _ __ (_) ___ ___
;;;;    \ \/ / _ \ '_ \| |/ __/ _ \
;;;;     \  /  __/ | | | | (_|  __/
;;;;      \/ \___|_| |_|_|\___\___|
;;;;
;;;;
;;;; Copyright 2017-2024 Venice
;;;;
;;;; Licensed under the Apache License, Version 2.0 (the "License");
;;;; you may not use this file except in compliance with the License.
;;;; You may obtain a copy of the License at
;;;;
;;;;     http://www.apache.org/licenses/LICENSE-2.0
;;;;
;;;; Unless required by applicable law or agreed to in writing, software
;;;; distributed under the License is distributed on an "AS IS" BASIS,
;;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;;; See the License for the specific language governing permissions and
;;;; limitations under the License.

;;;; Debugger demo

(do
  (ns foo)

  (defn wait [x] (sleep 300) (println x))

  (defn async-wait [x]
    (future (partial wait x)))

  (defn calc [& x]
    (let [a (first x) b (second x)]
      (->> x
           (filter even?)
           (map #(* % 10)))))

  (defn sum1 [x y]
    (+ x y))

  (defn sum2 [u v]
    (sum1 (* 2 u) v))

  (defn sum [s t]
    (let [s (+ 2 s)]
      (sum2 s t)))

  (defn mul [x y]
    (println "x" x)
    (println "y" y)
    (* x y))

  (defn sum-future [x y]
    (let [f (future (partial sum x y))]
      (deref f))))