Add count command to print how many notes exist

README.md

@@ -6,6 +6,7 @@ A tiny command-line notes tool, used as the practice repo for Unit 4, Lesson 3 (
 - `node notes.js add <text>` — add a note
 - `node notes.js list` — list all notes
 - `node notes.js search <term>` — list notes containing a term
+- `node notes.js count` — print how many notes you have
 - `node notes.js delete <id>` — delete a note
 
 Layout: `notes.js` is the entry point, `lib/store.js` loads, saves, and searches notes, `lib/config.js` holds settings, and `tests/` holds the test suite (`npm test`).

lib/store.js

@@ -36,6 +36,10 @@ function remove(id) {
   return data.notes.length < before;
 }
 
+function count() {
+  return load().notes.length;
+}
+
 // Returns the notes whose text contains `term`.
 function matches(notes, term) {
   return notes.filter((note) => note.text.includes(term));
@@ -45,4 +49,4 @@ function search(term) {
   return matches(load().notes, term);
 }
 
-module.exports = { all, add, remove, search, matches };
+module.exports = { all, add, remove, count, search, matches };

notes.js

@@ -39,14 +39,19 @@ function main() {
       }
       break;
     }
+    case "count": {
+      const total = store.count();
+      console.log(`You have ${total} ${total === 1 ? "note" : "notes"}.`);
+      break;
+    }
     case "delete": {
       const id = Number(rest[0]);
       const ok = store.remove(id);
       console.log(ok ? `Deleted note #${id}` : `No note #${id} found`);
       break;
     }
     default:
-      console.log("Commands: add <text> | list | search <term> | delete <id>");
+      console.log("Commands: add <text> | list | search <term> | count | delete <id>");
       console.log(`(Session locks after ${config.SESSION_TIMEOUT_MINUTES} minutes of inactivity.)`);
   }
 }

tests/notes.test.js

@@ -24,3 +24,8 @@ test("search returns nothing when no note contains the term", () => {
   const result = matches(notes, "xyz");
   assert.strictEqual(result.length, 0);
 });
+
+test("count matches the number of stored notes", () => {
+  const { all, count } = require("../lib/store");
+  assert.strictEqual(count(), all().length);
+});