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doc: clarify introductory module material #9816

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doc: clarify introductory module material #9816

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9 changes: 5 additions & 4 deletions doc/api/modules.md
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Node.js has a simple module loading system. In Node.js, files and modules
are in one-to-one correspondence (each file is treated as a separate module).
As an example, `foo.js` loads the module `circle.js` in the same directory.

The contents of `foo.js`:
As an example, consider a file named `foo.js`:

```js
const circle = require('./circle.js');
console.log(`The area of a circle of radius 4 is ${circle.area(4)}`);
```

The contents of `circle.js`:
On the first line, `foo.js` loads the module `circle.js` that is in the same
directory as `foo.js`.

Here are the contents of `circle.js`:

```js
const PI = Math.PI;

exports.area = (r) => PI * r * r;

exports.circumference = (r) => 2 * PI * r;

```

The module `circle.js` has exported the functions `area()` and
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