Modules

Summary

The `import`/`export` system that lets you split JavaScript into separate files with explicit dependencies, instead of one giant global script. Modules create explicit dependency boundaries, reduce global state, and make code easier to test, bundle, reuse, and maintain.

• 1Split a single script file into two modules using `export`/`import`. Validate your understanding by applying it in a small practical example.
• 2Learn the difference between named exports and a default export. Focus on understanding the underlying reason it works, not only memorizing the definition.
• 3Understand why modules are strict-mode and scoped by default.