ref: dumb it down, full Ai ahead!

ajquery.js

@@ -1,7 +1,10 @@
-function $(sel, $parent = document) {
-  return $parent.querySelector(sel);
+function $(cssSelector, $parent = document) {
+  let $child = $parent.querySelector(cssSelector);
+  return $child;
 }
 
-function $$(sel, $parent = document) {
-  return Array.from($parent.querySelectorAll(sel));
+function $$(cssSelector, $parent = document) {
+  let nodeList = $parent.querySelectorAll(cssSelector);
+  let $children = Array.from(nodeList);
+  return $children;
 }

example.html

@@ -6,6 +6,7 @@
   <script src="./ajquery.js"></script>
   <script>
     document.write("Hello, World!");
-    console.log($("body").textContent));
+    let text = $("body").textContent;
+    console.log(text);
   </script>
 </body>