78 lines
1.7 KiB
Markdown
78 lines
1.7 KiB
Markdown
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---
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title: Fibonacci sequence
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id: 597f24c1dda4e70f53c79c81
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localeTitle: 597f24c1dda4e70f53c79c81
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challengeType: 5
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---
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## Description
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<section id='description'>
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<p> Escribe una función para generar el <big>n <sup>º</sup></big> número de Fibonacci. </p>
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/// <p> El <big><sup>número</sup> n de</big> Fibonacci viene dado por:
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/// <p> F <sub>n</sub> = F <sub>n-1</sub> + F <sub>n-2</sub> </p>
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/// <p> Los dos primeros términos de la serie son 0, 1. </p>
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/// <p> Por lo tanto, la serie es: 0, 1, 1, 2, 3, 5, 8, 13 ... </p>
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///
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>fibonacci</code> es una función.
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testString: 'assert(typeof fibonacci === "function", "<code>fibonacci</code> is a function.");'
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- text: <code>fibonacci(2)</code> debe devolver un número.
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testString: 'assert(typeof fibonacci(2) == "number", "<code>fibonacci(2)</code> should return a number.");'
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- text: <code>fibonacci(3)</code> debe devolver 1. ")
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testString: 'assert.equal(fibonacci(3),1,"<code>fibonacci(3)</code> should return 1.");'
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- text: <code>fibonacci(5)</code> debe devolver 3. ")
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testString: 'assert.equal(fibonacci(5),3,"<code>fibonacci(5)</code> should return 3.");'
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- text: <code>fibonacci(10)</code> debe devolver 34. ")
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testString: 'assert.equal(fibonacci(10),34,"<code>fibonacci(10)</code> should return 34.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function fibonacci(n) {
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// Good luck!
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}
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function fibonacci(n) {
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let a = 0, b = 1, t;
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while (--n > 0) {
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t = a;
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a = b;
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b += t;
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}
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return a;
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}
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```
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</section>
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