From: Chris <chris.barker@nyu.edu>
Date: Sat, 14 Mar 2015 19:13:55 +0000 (-0400)
Subject: exx
X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=57dee2bbf8450a3ee982f8bdc868a6258b38da0e

exx
---

diff --git a/exercises/_assignment6.mdwn b/exercises/_assignment6.mdwn
index 86c398ff..9a3d04c0 100644
--- a/exercises/_assignment6.mdwn
+++ b/exercises/_assignment6.mdwn
@@ -112,21 +112,3 @@ our scorecard.  On the simple-minded view, we would replace it with
 `w`.  But that's not the right result, because `w` itself has been
 mapped onto 2.
 
-## Baby monads
-
-(Depends on lecture notes for safe division by zero.)
-
-Write a function `lift'` that generalized the correspondence between +
-and `add'`: that is, `lift'` takes any two-place operation on integers
-and returns a version that takes arguments of type `int option`
-instead, returning a result of `int option`.  In other words, `lift'`
-will have type:
-
-	(int -> int -> int) -> (int option) -> (int option) -> (int option)
-
-so that `lift' (+) (Some 3) (Some 4)` will evalute to `Some 7`.
-Don't worry about why you need to put `+` inside of parentheses.
-You should make use of `bind'` in your definition of `lift'`:
-
-	let bind' (u: int option) (f: int -> (int option)) =
-		match u with None -> None | Some x -> f x;;
diff --git a/exercises/_assignment7.mdwn b/exercises/_assignment7.mdwn
new file mode 100644
index 00000000..793a15e4
--- /dev/null
+++ b/exercises/_assignment7.mdwn
@@ -0,0 +1,18 @@
+## Baby monads
+
+(Depends on lecture notes for safe division by zero.)
+
+Write a function `lift'` that generalized the correspondence between +
+and `add'`: that is, `lift'` takes any two-place operation on integers
+and returns a version that takes arguments of type `int option`
+instead, returning a result of `int option`.  In other words, `lift'`
+will have type:
+
+	(int -> int -> int) -> (int option) -> (int option) -> (int option)
+
+so that `lift' (+) (Some 3) (Some 4)` will evalute to `Some 7`.
+Don't worry about why you need to put `+` inside of parentheses.
+You should make use of `bind'` in your definition of `lift'`:
+
+	let bind' (u: int option) (f: int -> (int option)) =
+		match u with None -> None | Some x -> f x;;