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Shopping Cart Mini (Standalone Component)

By FrontendAtlas Team · Updated Jan 30, 2026

Build a small shopping cart UI using an Angular standalone component. Render a product list with "Add to cart" buttons and a cart section where you can increase/decrease quantities, remove items, and show derived totals. Concepts: components, state, derived-state.

Use a standalone Angular component as the root component.
Render a static product list with name and price for each product.

What you’ll build / What this tests

This premium angular coding focuses on Shopping Cart Mini (Standalone Component). You’ll apply components and state thinking with hard level constraints. The prompt emphasizes Build a small shopping cart UI using an Angular standalone component. Render a product list with….

Learning goals

Translate the prompt into a clear angular API signature and return shape.
Apply components, state, derived-state techniques to implement shopping cart mini (standalone component).
Handle hard edge cases without sacrificing readability.
Reason about time/space complexity and trade-offs in angular.

Key decisions to discuss

Define the exact input/output contract before coding.
Choose iteration vs higher-order methods for readability.
Prioritize predictable edge-case handling over micro-optimizations.

Evaluation rubric

Correctness: covers required behaviors and edge cases.
Clarity: readable structure and predictable control flow.
Complexity: avoids unnecessary work for large inputs.
API discipline: no mutation of inputs; returns expected shape.
Testability: solution is easy to unit test.

Constraints / Requirements

Use a standalone Angular component as the root component.
Render a static product list with name and price for each product.
Each product should have an "Add to cart" button.
Render a cart section that lists all items currently in the cart.
Each cart item should show name, unit price, quantity, and line total (price × quantity).
In the cart, allow increasing and decreasing the quantity of an item.
Allow removing an item from the cart entirely.
Show derived totals: overall item count (total quantity) and total price for the entire cart.
Keep the cart state in a nested structure (e.g. an array of cartItems).
Clicking "Add to cart" for a product adds it to the cart with quantity 1 (or increments the…

Mini snippet (usage only)

// Example usage
const input = /* shopping cart mini (standalone component) input */;
const result = solve(input);
console.log(result);

// Edge case check
const empty = input ?? null;
const fallback = solve(input);
console.log(fallback);

// Expected: describe output shape, not the implementation
// (no solution code in preview)

Common pitfalls

Mutating inputs instead of returning a new value.
Skipping edge cases like empty input, duplicates, or nulls.
Overlooking time complexity for large inputs.