Add an edit command to the notes CLI

[VikLchv]

Adds an edit command so notes can be updated in place: node notes.js edit <id> <text>.

• New store.edit(id, text) helper in lib/store.js.
• New edit case in notes.js, and the command is listed in the default help line.

Opened for review as part of Unit 4 Lesson 4.

[VikLchv]

Review — edit command

🔴 Critical: store.edit crashes when the id doesn't exist.

const note = data.notes.find((n) => n.id === id);
note.text = text; // note is undefined when no id matches → TypeError

find returns undefined for a missing id, so note.text = text throws TypeError: Cannot set properties of undefined. Reproduced: node notes.js edit 99 "x" crashes with a stack trace (exit 1). remove already guards this case and returns a boolean — edit should too.

🟠 The CLI always reports success. notes.js prints Updated note #${id} unconditionally because edit returns nothing, so editing a missing id would falsely claim success even after the crash is fixed.

🟡 Minor: no validation. A non-numeric id is NaN (never matches → same crash path); an empty text silently blanks the note.

Suggested fix: make edit return whether it found the note and branch the message, mirroring delete:

function edit(id, text) {
  const data = load();
  const note = data.notes.find((n) => n.id === id);
  if (!note) return false;
  note.text = text;
  save(data);
  return true;
}
// notes.js
const ok = store.edit(id, text);
console.log(ok ? `Updated note #${id}` : `No note #${id} found`);

[VikLchv]

Verdict: Claude caught the planted bug — store.edit crashes with a TypeError when the note id doesn't exist (unguarded find). Confirmed by reproducing the crash.

[VikLchv]

done