---
id: 587d7b8c367417b2b2512b55
title: Reuse Javascript Code Using import
challengeType: 1
---

## Description
<section id='description'>
<code>import</code> allows you to choose which parts of a file or module to load. In the previous lesson, the examples exported <code>add</code> from the file <code>math_functions.js</code>. Here's how you can import them into another file:

```js
import { add } from './math_functions.js';
```

Here, <code>import</code> will find <code>add</code> in <code>math_functions.js</code>, import just that function for you to use, and ignore the rest. The <code>./</code> tells the import to look for the <code>math_functions.js</code> file in the same folder that the file which uses the import statement is. The relative file path (<code>./</code>) and file extension (<code>.js</code>) are required when using import in this way.

You can import multiple items like this:

```js
import { add, subtract } from './math_functions.js';
```

</section>

## Instructions
<section id='instructions'>
Add the appropriate <code>import</code> statement that will allow the current file to use the <code>capitalizeString</code> and <code>lowerCaseString</code> functions you exported in the previous lesson. These functions are in a file called <code>string_functions.js</code>, which is in the same directory as the current file.
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: You should properly import <code>capitalizeString</code>.
    testString: getUserInput => assert(getUserInput('index').match(/import\s*\{\s*capitalizeString\s*\}\s*from\s*("|')(\.\/string_functions|string_functions)\1(|\/\/|;\s|\s)/g));
  - text: You should properly import <code>lowerCaseString</code>.
    testString: getUserInput => assert(getUserInput('index').match(/import\s*\{\s*capitalizeString\s*\}\s*from\s*("|')(\.\/string_functions|string_functions)\1(|\/\/|;\s|\s)/g));
```

</section>

## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>

```js



// add code above this line

console.log(capitalizeString("hello"));
console.log(lowerCaseString("WORLD!"));
```

</div>

### Before Test
<div id='js-setup'>

```js
self.require = function() {
  return {
    capitalizeString: str => str.toUpperCase(),
    lowerCaseString: str => str.toLowerCase()
  }
};
```

</div>
</section>

## Solution
<section id='solution'>

```js
import { capitalizeString } from './string_functions';
capitalizeString("hello!");
```

</section>