---
id: 587d7b8c367417b2b2512b58
title: Create an Export Fallback with export default
challengeType: 1
videoUrl: ''
localeTitle: ''
---

## Description
undefined

## Instructions
undefined

## Tests
<section id='tests'>

```yml
tests:
  - text: ''
    testString: 'getUserInput => assert(getUserInput("index").match(/export\s+default\s+function\s+subtract\(x,y\)\s+{return\s+x\s-\s+y;}/g), "Proper used of <code>export</code> fallback.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
"use strict";
function subtract(x,y) {return x - y;}

```

</div>

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

```js
window.exports = function(){};

```

</div>


</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>