Dynamic Import

Dynamic Import is a JavaScript language feature that allows modules to be loaded asynchronously at runtime, rather than statically at compile time. It enables code-splitting and lazy loading, where parts of an application are fetched only when needed, improving initial load performance. This is implemented using the `import()` function, which returns a promise that resolves to the module's namespace object.

Also known as: Dynamic Module Import, Lazy Import, Async Import, import(), Code Splitting

Why learn Dynamic Import?

Developers should use Dynamic Import to optimize web applications by reducing initial bundle sizes and improving load times, especially for large single-page applications (SPAs) or features that are not immediately required. It's essential for implementing lazy loading of routes, components, or libraries in frameworks like React, Vue, or Angular, and for conditionally loading polyfills or modules based on user interactions or device capabilities.

Learning Resources

• docs: MDN Web Docs: Dynamic Import
• tutorial: JavaScript.info: Dynamic Imports
• docs: Webpack Code Splitting Guide
• docs: React Lazy Loading Documentation
• video: YouTube: Dynamic Imports in JavaScript