Work on depdent tuped

Why no work

dependent-types.lean

@@ -0,0 +1,32 @@
+
+
+-- Ok, from what I understnad dependent types are kind of the type
+-- equvileant to first-class functions.  Types can be stored,
+-- returned, kinda like in zig. 
+
+-- Btw unicode is cool, reminds me of raku
+def α : Type := Nat
+-- α is a variable that stores the type
+#check α    -- > α : Type
+
+-- BTW #check is like eval but works for types
+
+-- This is a function that takes a type and returns a type
+def F : Type → Type := List
+
+#check F α
+
+def IntOrString (isInt : Bool) : Type :=
+  match isInt with
+    | false => Int
+    | true => String
+
+#check IntOrString false
+
+-- showOrReverse : (isInt : Bool) -> IntOrString isInt -> String
+def negateOrIdentity (isString : Bool) (val : IntOrString isString)  : IntOrString isString :=
+   match isString with
+    | true => val
+    | false => -val
+
+#eval negateOrIdentity true "yo"