Update `logMemory` to add an option to log just a specific range

logging.js

@@ -1,11 +1,22 @@
-const logMemory = (x) => {
+const logMemory = (mem, start=0, end=mem.length) => {
+  // This function can only handle
+  // an even number of array entries
+  if ((start % 2) === 1) { start -= 1; }
+  if ((end % 2) === 1) { end += 1; }
+
+  mem = mem.slice(start, end);
   console.log(`┌────────┬────────┬────────┐`);
   console.log(`│  addr  │   op   │   arg  │`);
   console.log(`├────────┼────────┼────────┤`);
-  for (let i = 0; i < x.length; i += 2) { 
-    console.log(`│   ${num2hex(i)}   │   ${num2hex(x[i])}   │   ${num2hex(x[i+1])}   │`);
+  //for (let i = 0; i < mem.length; i += 2) { 
+  for (let i = start; i < mem.length; i +=2) {
+    console.log(`│   ${num2hex(i)}   │   ${num2hex(mem[i])}   │   ${num2hex(mem[i+1])}   │`);
+
+    // Add a blank row every 4 lines:
     if (((i + 2) % 8) === 0) {
+      if ((i < (mem.length - 2))) {
       console.log(`│        │        │        │`);
+      }
     }
   }
   console.log(`└────────┴────────┴────────┘`);

readme.md

@@ -19,7 +19,7 @@
 - [x] Make $0F a NOP
 - [ ] In assembler.js: validateLabel()
 - [ ] In assemble.js: print better output to stdout
-- [ ] Add a function for logging just a specific range of memory
+- [x] Add a function for logging just a specific range of memory
 
 ### Under-the-hood improvements