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Task/24-game/EchoLisp/24-game.echolisp

@@ -0,0 +1,31 @@
+(string-delimiter "")
+;; check that nums are in expr, and only once
+(define (is-valid? expr sorted: nums)
+    (when (equal? 'q expr) (error "24-game" "Thx for playing"))
+    (unless (and
+        (list? expr)
+        (equal? nums (list-sort < (filter number? (flatten expr)))))
+    (writeln "🎃 Please use" nums)
+    #f))
+
+;; 4 random  digits
+(define (gen24)
+     (->> (append (range 1 10)(range 1 10)) shuffle (take 4) (list-sort < )))
+
+(define (is-24? num)
+    (unless (= 24 num)
+    (writeln "😧 Sorry - Result = " num)
+    #f))
+
+(define (check-24 expr)
+    (if (and
+        (is-valid? expr nums)
+        (is-24?  (js-eval (string expr)))) ;; use js evaluator
+        "🍀 🌸 Congrats - (play24) for another one."
+        (input-expr check-24 (string nums))))
+
+(define nums null)
+(define (play24)
+    (set! nums (gen24))
+    (writeln "24-game - Can you combine" nums "to get 24 ❓ (q to exit)")
+    (input-expr check-24 (string-append  (string nums) " -> 24 ❓")))