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Task/Extend-your-language/Fennel/extend-your-language.fennel

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+;; Fennel, being a Lisp, provides a way to define macros for new syntax.
+;; The "`" and "," characters are used to construct a template for the macro.
+(macro if2 [cond1 cond2 both first second none]
+  `(if ,cond1
+     (if ,cond2 ,both ,first)
+     (if ,cond2 ,second ,none)))
+
+(fn test-if2 [x y]
+  (if2 x y
+    (print "both")
+    (print "first")
+    (print "second")
+    (print "none")))
+
+(test-if2 true true)   ;"both"
+(test-if2 true false)  ;"first"
+(test-if2 false true)  ;"second"
+(test-if2 false false) ;"none"