---
title: Gray code
id: 5a23c84252665b21eecc7e80
challengeType: 5
videoUrl: ''
localeTitle: ''
---

## Description
undefined

## Instructions
undefined

## Tests
<section id='tests'>

```yml
tests:
  - text: ''
    testString: 'assert(typeof gray=="function","<code>gray</code> should be a function.");'
  - text: ''
    testString: 'assert(typeof gray(true,177)=="number","<code>gray(true,177)</code> should return a number.");'
  - text: ''
    testString: 'assert.equal(gray(true,177),233,"<code>gray(true,177)</code> should return <code>233</code>.");'
  - text: ''
    testString: 'assert.equal(gray(true,425),381,"<code>gray(true,425)</code> should return <code>381</code>.");'
  - text: ''
    testString: 'assert.equal(gray(true,870),725,"<code>gray(true,870)</code> should return <code>725</code>.");'
  - text: ''
    testString: 'assert.equal(gray(false,233),177,"<code>gray(false,233)</code> should return <code>177</code>.");'
  - text: ''
    testString: 'assert.equal(gray(false,381),425,"<code>gray(false,381)</code> should return <code>425</code>.");'
  - text: ''
    testString: 'assert.equal(gray(false,725),870,"<code>gray(false,725)</code> should return <code>870</code>.");'

```

</section>

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

<div id='js-seed'>

```js
function gray(enc, number) {
 // Good luck!
}

```

</div>



</section>

## Solution
<section id='solution'>

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