changes

[lambda.git] / assignment6.mdwn

diff --git a/assignment6.mdwn b/assignment6.mdwn
index 853403d..a31cbf8 100644 (file)
--- a/assignment6.mdwn
+++ b/assignment6.mdwn
@@ -1,18 +1,18 @@
-1.  **Build a state monad.** Based on the division by zero monad,
+1.  **Build a State monad.** Based on the division by zero monad,

 build a system that will evaluate arithmetic expressions.  Instead of
 returning a simple integer as a result, it will deliver the correct
 answer along with a count of the number of operations performed during
 the calculation.  That is, the desired behavior should be like this:
 
 build a system that will evaluate arithmetic expressions.  Instead of
 returning a simple integer as a result, it will deliver the correct
 answer along with a count of the number of operations performed during
 the calculation.  That is, the desired behavior should be like this:
 

-                 # lift ( + ) (lift ( / ) (unit 20) (unit 2)) 
-                                 (lift ( * ) (unit 2) (unit 3)) 0;;
+                 # lift2 ( + ) (lift2 ( / ) (unit 20) (unit 2))
+                                  (lift2 ( * ) (unit 2) (unit 3)) 0;;

                      - : int * int = (16, 3)
 
                      - : int * int = (16, 3)
 

-    Here, `lift` is the function that uses `bind` to prepare an ordinary
+    Here, `lift2` is the function that uses `bind` to prepare an ordinary

 arithmetic operator (such as addition `( + )`, division `( / )`, or
 multiplication `( * )`) to recieve objects from the counting monad as
 arguments.  The response of the interpreter says two things: that
 arithmetic operator (such as addition `( + )`, division `( / )`, or
 multiplication `( * )`) to recieve objects from the counting monad as
 arguments.  The response of the interpreter says two things: that

-(20/2) + (2*3) = 16, and that the computation took three arithmetic
+(20/2) + (2\*3) = 16, and that the computation took three arithmetic

 steps.  By the way, that zero at the end provides the monadic object
 with a starting point (0 relevant computations have occurred previous
 to the current computation).
 steps.  By the way, that zero at the end provides the monadic object
 with a starting point (0 relevant computations have occurred previous
 to the current computation).


@@ -21,8 +21,11 @@ to the current computation).
 divide by zero (so there should be no int option types anywhere in
 your solution).
 
 divide by zero (so there should be no int option types anywhere in
 your solution).
 

-     You'll need to define a computation monad type, unit, bind, and lift.
-We encourage you to consider this hint: [[Assignment 6 Hint 1]].
+     You'll need to define a computation monad type, unit, bind, and lift2.
+We encourage you to consider this hint: [[hints/Assignment 6 Hint 1]].
+
+       See our [commentary](/hints/assignment_6_commentary) on your solutions.
+

 
 2. Prove that your monad satisfies the monad laws.  First, give
 examples illustrating specific cases in which the monad laws are
 
 2. Prove that your monad satisfies the monad laws.  First, give
 examples illustrating specific cases in which the monad laws are