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freeCodeCamp/curriculum/challenges/russian/08-coding-interview-prep/rosetta-code/fibonacci-sequence.russian.md

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---
title: Fibonacci sequence
id: 597f24c1dda4e70f53c79c81
challengeType: 5
forumTopicId: 302268
localeTitle: Последовательность Фибоначчи
---
## Description
<section id='description'>
<p> Напишите функцию для генерации <big>n- <sup>го</sup></big> числа Фибоначчи. </p> /// <p> <big>N- <sup>е</sup></big> число Фибоначчи дается: /// </p><p> F <sub>n</sub> = F <sub>n-1</sub> + F <sub>n-2</sub> </p> /// <p> Первые два члена серии - 0, 1. </p> /// <p> Следовательно, ряд равен: 0, 1, 1, 2, 3, 5, 8, 13 ... </p> ///
</section>
## Instructions
<section id='instructions'>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>fibonacci</code> is a function.
testString: assert(typeof fibonacci === 'function');
- text: <code>fibonacci(2)</code> should return a number.
testString: assert(typeof fibonacci(2) == 'number');
- text: <code>fibonacci(3)</code> should return 1.
testString: assert.equal(fibonacci(3),1);
- text: <code>fibonacci(5)</code> should return 3.
testString: assert.equal(fibonacci(5),3);
- text: <code>fibonacci(10)</code> should return 34.
testString: assert.equal(fibonacci(10),34);
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function fibonacci(n) {
// Good luck!
}
```
</div>
</section>
## Solution
<section id='solution'>
```js
function fibonacci(n) {
let a = 0, b = 1, t;
while (--n > 0) {
t = a;
a = b;
b += t;
}
return a;
}
```
</section>