Full playable demo

Try the finished feature

Use the finished version before you build it yourself.

Playable result only — the source code stays hidden.

Mission 00 4 min

Mission 0: See What You’re Building

Try the finished feature first. Then build it in small, clear steps.

Build roadmap

What you’ll build, mission by mission

  1. 1
    Make “Add to Bag” Remember the Product

    Add the clicked product object to a shopping-cart array.

  2. 2
    Update the Bag Counter

    Display the current cart length in the header.

  3. 3
    Open the Cart After Adding

    Open the cart automatically after an item is added.

Mission demoMake “Add to Bag” Remember the Product

Finished result only — the answer code stays hidden.