Incremental builds with data in Astro - Mini Project: Build & Apply

Incremental Builds with Data in Astro

📖 Scenario: You are building a simple Astro website that shows a list of books. You want to use incremental builds to only update the pages for books that have changed. This helps your site build faster and stay up to date.

🎯 Goal: Create an Astro component that loads a list of books, sets a build configuration for incremental builds, filters books by a minimum rating, and exports the final filtered list for rendering.

📋 What You'll Learn

Create a constant books with exactly three book objects with title and rating properties

Create a constant minRating set to 4

Use a filter method on books to create filteredBooks with only books having rating >= minRating

Export filteredBooks as the default export for the component

💡 Why This Matters

🌍 Real World

Incremental builds help websites update only changed parts, saving time and resources when deploying content like book lists or product catalogs.

💼 Career

Understanding incremental builds and data filtering is important for frontend developers working with modern frameworks like Astro to optimize site performance.

1

Create the initial books data

Create a constant called books that is an array with these exact objects: { title: 'Astro Basics', rating: 5 }, { title: 'Learn JavaScript', rating: 3 }, and { title: 'Web Design', rating: 4 }.

Astro

// Your code here

Hint

Use const books = [ ... ] with the exact objects inside the array.

2

Add a minimum rating configuration

Create a constant called minRating and set it to the number 4.

Astro

const books = [
  { title: 'Astro Basics', rating: 5 },
  { title: 'Learn JavaScript', rating: 3 },
  { title: 'Web Design', rating: 4 }
];
// Your code here

Hint

Use const minRating = 4; to set the minimum rating.

3

Filter books by minimum rating

Create a constant called filteredBooks that filters books to include only those with rating greater than or equal to minRating. Use the filter method with a callback that takes book as parameter.

Astro

const books = [
  { title: 'Astro Basics', rating: 5 },
  { title: 'Learn JavaScript', rating: 3 },
  { title: 'Web Design', rating: 4 }
];

const minRating = 4;
// Your code here

Hint

Use books.filter(book => book.rating >= minRating) to filter the array.

4

Export the filtered books for incremental build

Add a default export that exports the filteredBooks constant.

Astro

const books = [
  { title: 'Astro Basics', rating: 5 },
  { title: 'Learn JavaScript', rating: 3 },
  { title: 'Web Design', rating: 4 }
];

const minRating = 4;

const filteredBooks = books.filter(book => book.rating >= minRating);
// Your code here

Hint

Use export default filteredBooks; to export the filtered list.