From 62abed25f0f396cd548b833805f4219cbdf79533 Mon Sep 17 00:00:00 2001 From: Chris Date: Mon, 16 Mar 2015 12:19:30 -0400 Subject: [PATCH] edits --- topics/_week7_monads.mdwn | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/topics/_week7_monads.mdwn b/topics/_week7_monads.mdwn index 3f2955e9..da0b0080 100644 --- a/topics/_week7_monads.mdwn +++ b/topics/_week7_monads.mdwn @@ -48,27 +48,23 @@ We'll often write box types as a box containing the value of the free type variable. So if our box type is `α List`, and `α == Int`, we would write -
Int
+Int for the type of a boxed Int. At the most general level, we'll talk about *Kleisli arrows*: -P ->
Q
+P -> Q A Kleisli arrow is the type of a function from objects of type P to objects of type box Q, for some choice of type expressions P and Q. For instance, the following are arrows: -Int ->
Bool
+Int -> Bool -Int List ->
Int List
+Int List -> Int List Note that the left-hand schema can itself be a boxed type. That is, if `α List` is our box type, we can write the second arrow as -
Int
--> -
Int
- +Int -> Int -- 2.11.0