From 2ba0d2e3db9e8754bc533b73e5012e09399560fc Mon Sep 17 00:00:00 2001
From: jim
Date: Mon, 6 Apr 2015 18:30:37 0400
Subject: [PATCH] remove toc

topics/_week9_transformers.mdwn  2 
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[[!toc]]

So far, we've defined monads as singlelayered boxes. In practice, one often wants to combine the abilities of several monads. Corresponding to each monad like Reader, there's a corresponding ReaderT **monad transformer**. That takes an existing monad M and wraps Readerish monad packaging around it. The way these are defined parallels the way the singlelayer versions are defined. For example, here's the Reader monad:
(* monadic operations for the Reader monad *)

2.11.0