Add lab 4 content.

journal/_src/posts/2022-09-21-lab-four.md

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+    Title: Lab Four
+    Date: 2022-09-21T08:30:00
+    Tags: cs2163, lab, racket, scribble
+
+In this lab I learned about using functions as values, recursion, scribble, and modules in Racket.
+<!-- more -->
+## Functions as values
+You can pass functions as values into other functions which can then be used inside another function, or pass values into said function. This makes it easy to use a function a lot, or build a list of a function for  example, with increasing values as its arguments.
+
+## Recursion
+In racket I implemented a factorial function with recursion, and then tested the function to assure that the function is performing correctly.
+
+## Scribble Demo
+I learned how you can use Scribble to use racket in a web page, to programatically generate web content.
+
+## Modules
+I leanned about how to make modules, submodules, testing modules, and a main module. This was shown in a simple program that defined and exported one function called `hello` which simply printed "Hello!" I then used it in another application by using the `require` keyword. I then defined a main module that says when a the hello module is loaded it should print "Hello!"

journal/_src/posts/2022-09-21-lab-three-scribble-demo.scrbl

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+#lang scribble/manual
+
+Title: Lab Three Scribble Demo
+Date: 2022-09-21T09:00:00
+Tags: cs2613, lab, racket, scribble
+
+Demo of how Scribble works
+
+<!-- more -->
+
+@(define (hello) "hello")
+@(define (todo hdr . lst) (list (bold hdr) (apply itemlist (map item lst))))
+@hello{}
+@todo["Shopping" "cheese" "fish" "shuriken"]