From: jim <jim@web>
Date: Mon, 23 Feb 2015 18:32:22 +0000 (-0500)
Subject: add <a id=flipped-cons>
X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=063c22f99e0cacb54e0026057bfacdecbc34d394;ds=sidebyside

add <a id=flipped-cons>
---

diff --git a/topics/week2_encodings.mdwn b/topics/week2_encodings.mdwn
index 85d4d77b..091fb4c5 100644
--- a/topics/week2_encodings.mdwn
+++ b/topics/week2_encodings.mdwn
@@ -231,6 +231,7 @@ That will evaluate to whatever this does:
 
     f (f (f (z, 10), 20), 30)
 
+<a id=flipped-cons></a>
 With a commutative operator like `(+)`, it makes no difference whether you say `fold_right ((+), z) xs` or `fold_left ((+), z) xs`. But with other operators it will make a difference. We can't say `fold_left ((&), []) [10, 20, 30]`, since that would start by trying to evaluate `[] & 10`, which would crash. But we could do this:
 
     let