Turn on Jsdoc-based type checking

jsconfig.json

@@ -0,0 +1,6 @@
+{
+  "compilerOptions": {
+    "checkJs": true
+  },
+  "exclude": ["node_modules", "**/node_modules/*"]
+}

logging.js

@@ -1,3 +1,10 @@
+/**
+ * Display a table of memory locations.
+ * Call with [start] and [end] indices to display a range.
+ * @param {Uint8Array} mem - Memory to display
+ * @param {number}  [start] - A start-index, in decimal
+ * @param {number}  [end] - An end-index, in decimal
+ **/
 const logMemory = (mem, start=0, end=mem.length) => {
   // This function can only handle
   // an even number of array entries
@@ -15,7 +22,7 @@ const logMemory = (mem, start=0, end=mem.length) => {
     // Add a blank row every 4 lines:
     if (((i + 2) % 8) === 0) {
       if ((i < (mem.length - 2))) {
-      console.log(`│        │        │        │`);
+        console.log(`│        │        │        │`);
       }
     }
   }
@@ -30,7 +37,16 @@ const logRunningHeader = () => {
   console.log( `└─────────────────────┘`);
 }
 
+/** 
+ * @param {number} num
+ * @returns {string}
+ */
 const num2hex = (num) => num.toString(16).toUpperCase().padStart(2, "0");
+
+/** 
+ * @param {string} hex
+ * @returns {number}
+ */
 const hex2num = (hex) => parseInt(hex, 16);
 
 module.exports = {