Shopping Cart Logic
Write reliable cart logic: quantities, discounts, taxes and totals that always add up.
What you'll learn
- Model cart items and totals
- Handle money without floating-point errors
- Apply discount codes and shipping rules
- Test cart rules with Vitest
About this course
You build the cart logic for a store as plain JavaScript modules, then connect it to a UI. You cover rounding, discount codes and edge cases, and you write tests for each rule.
Course curriculum
4 modules and 12 lessons over 3 weeks. Plan for about 9 learning hours.
01Cart modelWeek 1 · 3 lessons
- Items and quantities
- Totals
- Money in cents
02RulesWeek 1 · 3 lessons
- Discount codes
- Shipping thresholds
- Tax display
03TestsWeek 2 · 3 lessons
- Vitest setup
- Edge cases
- Refactoring with tests
04UIWeek 3 · 3 lessons
- Connecting to the page
- Persisting the cart
- Error messages
Project
Cart engine. A tested cart module with discounts and shipping rules, connected to a sample store UI.
Who this course is for
Developers building e-commerce front ends who need cart math to be correct.
Prerequisites
You know JavaScript functions, arrays and objects.
What's included
- 120-day course access
- Step-by-step lessons
- Practice files
- Reusable code templates
- A graded final exercise
- A digital completion certificate
Learning format
Self-paced practical course, part of our self-paced courses. Graded final exercise with written feedback.
Access and delivery
- Enrollment is activated within 15 minutes after payment.
- Final exercise feedback is delivered within 2 business days of submission, and the completion certificate is issued within 2 business days after passing the final exercise.
Certificate
You receive a digital completion certificate. Final exercise feedback is delivered within 2 business days of submission, and the completion certificate is issued within 2 business days after passing the final exercise.
Frequently asked questions
When does access start?
Enrollment is activated within 15 minutes after payment.
Is payment taken on this website?
No. After you submit your enrollment request, we reply by email with payment details and enrollment confirmation.
Does this course guarantee a job or income?
No. It is an education and training service and does not include employment, income or placement guarantees.
Can I cancel?
Our Refund and Cancellation Policy lists the terms for self-paced course programs.
