freeCodeCamp/curriculum/challenges/arabic/08-coding-interview-prep/project-euler/problem-25-1000-digit-fibon...

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---
id: 5900f3851000cf542c50fe98
challengeType: 5
title: 'Problem 25: 1000-digit Fibonacci number'
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'assert.strictEqual(digitFibonacci(5), 21, "<code>digitFibonacci(5)</code> should return 21.");'
- text: ''
testString: 'assert.strictEqual(digitFibonacci(10), 45, "<code>digitFibonacci(10)</code> should return 45.");'
- text: ''
testString: 'assert.strictEqual(digitFibonacci(15), 69, "<code>digitFibonacci(15)</code> should return 69.");'
- text: ''
testString: 'assert.strictEqual(digitFibonacci(20), 93, "<code>digitFibonacci(20)</code> should return 93.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function digitFibonacci(n) {
// Good luck!
return n;
}
digitFibonacci(20);
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>