added short comments for all JS functions

beastify/content_scripts/beastify.js

@@ -1,18 +1,33 @@
-// Assign beastify() as a listener for messages from the extension.
+/*
+Assign beastify() as a listener for messages from the extension.
+*/
 chrome.runtime.onMessage.addListener(beastify);
 
+/*
+beastify():
+* removes every node in the document.body,
+* then inserts the chosen beast
+* then removes itself as a listener 
+*/
 function beastify(request, sender, sendResponse) {
   removeEverything();
   insertBeast(beastNameToURL(request.beast));
   chrome.runtime.onMessage.removeListener(beastify);
 }
 
+/*
+Remove every node under document.body
+*/
 function removeEverything() {
   while (document.body.firstChild) {
     document.body.firstChild.remove();
   }
 }
 
+/*
+Given a URL to a beast image, create and style an IMG node pointing to
+that image, then insert the node into the document.
+*/
 function insertBeast(beastURL) {
   var beastImage = document.createElement("img");
   beastImage.setAttribute("src", beastURL);
@@ -21,6 +36,9 @@ function insertBeast(beastURL) {
   document.body.appendChild(beastImage);
 }
 
+/*
+Given the name of a beast, get the URL to the corresponding image.
+*/
 function beastNameToURL(beastName) {
   switch (beastName) {
     case "Frog":