Exporting values in Javascript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of exporting values in JavaScript modules?

Exporting values allows you to share variables, functions, or objects from one file so other files can use them.

beginner

How do you export a single value as the default export in JavaScript?

Use export default followed by the value, for example: export default function() {}.

intermediate

What is the difference between named exports and default exports?

Named exports let you export multiple values by name, while default export lets you export one main value per module.

beginner

How do you export multiple values from a module?

You list them inside curly braces after the export keyword, like export { a, b, c }.

beginner

Can you export a value immediately when declaring it? Give an example.

Yes, for example: <code>export const pi = 3.14;</code> exports the constant <code>pi</code> right away.

Which keyword is used to export a value from a JavaScript module?

A import

B require

C module

D export

The export keyword is used to share values from a module.

How do you export a function as the default export?

A export default function myFunc() {}

B export function myFunc() {}

C export { myFunc }

D default export function myFunc() {}

Use export default function myFunc() {} to export a function as default.

Which syntax exports multiple named values at once?

A export default { a, b }

B export (a, b)

C export { a, b }

D export a, b

Use export { a, b } to export multiple named values.

Can a module have more than one default export?

A No, only one default export

B Yes, but only two

C Yes, unlimited

D Only if named

A module can have only one default export.

What does this code do? export const name = 'Alice';

A Imports a constant named name

B Exports a constant named name

C Declares a variable without exporting

D Exports a default value

It exports a constant named name with the value 'Alice'.

Explain how to export multiple values from a JavaScript module and how to import them.

Think about curly braces and matching names.

Describe the difference between default export and named export with examples.

One uses 'export default', the other uses 'export { }'.