posts/ccgoto: add scheme tag

site-src/burrito.mdx

@@ -0,0 +1,58 @@
+---
+title: "Monads: Why and how"
+description: I could not repress the urge to make a monad explainer any longer. Did you know that a monad is a monoid in the category of endofunctors? 
+tags: post,short,haskell
+date: 2026-05-06 01:20:10 -5
+---
+
+I acknowledge that [the world wide web has one hundred trillion monad explainers.](https://wiki.haskell.org/Monad_tutorials_timeline)
+
+![Chart titled "Number of known monad tutorials. It grew from zero in 1991 to fifteenish in 2005 before increasing in speed and ending at about 120 in 2023](https://wiki.haskell.org/wikiupload/2/23/Monad-tutorials-chart.png)
+
+## Why monads
+In the land of Haskell and friends, we love referential transparency.
+We greatly appreciate that
+```haskell
+let x = 1 in x + x
+```
+will always have the same result as
+```haskell
+1 + 1
+```
+
+In languages where (almost) no functions have unmarked side-effects, like Haskell, you can even be confident that
+```haskell
+let x = f y in x + x
+```
+is the same as
+```haskell
+(f y) + (f y)
+```
+
+This is a truly excellent property to have, but it causes some problems when your program starts interacting with the world.
+
+Aside from referential transparency, we don't want to fix evaluation order if we don't have to;
+giving the compiler more freedom to reorder evaluation lets it perform more optimizations.
+And we always want more optimizations.
+
+But, quite often, we *need* things to happen in a specific order.
+
+Monads let us do two things:
+1. Order operations
+2. Use past results to decide what to do next
+
+## How monads
+Easy:
+```haskell
+class Monad m where
+    (>>=) :: m a -> (a -> m b) -> m b
+    pure :: a -> m a
+```
+
+`>>=`, pronounced `bind`, gives us ordering and lets us use past results to decide what to do next.
+
+The fact that it gives us ordering is made more clear if we define `>>`, which ignores its result:
+```haskell
+(>>) :: m a -> m b -> m b
+a >> b = a >>= \_ -> b
+```

site-src/ccgoto.mdx

@@ -1,7 +1,7 @@
 ---
 title: Emulating GOTO in Scheme with continuations
 description: GOTO sucks and is evil and I hate it, but what if there were parentheses? `call/cc` is kinda like goto, so let’s use it to make goto.
-tags: post,medium
+tags: post,medium,scheme
 date: 2026-02-18 14:28:46 -5
 ---