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Task/Factorial/LFE/factorial-1.lfe

@@ -0,0 +1,4 @@
+(defun factorial (n)
+  (cond
+    ((== n 0) 1)
+    ((> n 0) (* n (factorial (- n 1))))))

Task/Factorial/LFE/factorial-2.lfe

@@ -0,0 +1,4 @@
+(defun factorial
+  ((n) (when (== n 0)) 1)
+  ((n) (when (> n 0))
+    (* n (factorial (- n 1)))))

Task/Factorial/LFE/factorial-3.lfe

@@ -0,0 +1,4 @@
+(defun factorial
+  ((0) 1)
+  ((n) (when (> n 0))
+    (* n (factorial (- n 1)))))

Task/Factorial/LFE/factorial-4.lfe

@@ -0,0 +1,7 @@
+(defun factorial (n)
+  (factorial n 1))
+
+(defun factorial
+  ((0 acc) acc)
+  ((n acc) (when (> n 0))
+    (factorial (- n 1) (* n acc))))

Task/Factorial/LFE/factorial-5.lfe

@@ -0,0 +1,12 @@
+> (lists:map #'factorial/1 (lists:seq 10 20))
+(3628800
+ 39916800
+ 479001600
+ 6227020800
+ 87178291200
+ 1307674368000
+ 20922789888000
+ 355687428096000
+ 6402373705728000
+ 121645100408832000
+ 2432902008176640000)

Task/Factorial/LFE/factorial-6.lfe

@@ -0,0 +1,16 @@
+> (lists:foreach
+    (lambda (x)
+      (io:format '"~p~n" `(,(factorial x))))
+    (lists:seq 10 20))
+3628800
+39916800
+479001600
+6227020800
+87178291200
+1307674368000
+20922789888000
+355687428096000
+6402373705728000
+121645100408832000
+2432902008176640000
+ok