freeCodeCamp/curriculum/challenges/spanish/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/map-the-debris.spanish.md

---
id: af4afb223120f7348cdfc9fd
title: Map the Debris
localeTitle: Mapa de los escombros
challengeType: 5
---

## Description
<section id='description'> 
Devuelve una nueva matriz que transforma la altitud promedio de los elementos en sus períodos orbitales (en segundos). 
La matriz contendrá objetos en el formato <code>{name: &#39;name&#39;, avgAlt: avgAlt}</code> . 
Puedes leer sobre periodos orbitales <a href="http://en.wikipedia.org/wiki/Orbital_period" target='_blank'>en Wikipedia</a> . 
Los valores deben redondearse al número entero más cercano. El cuerpo que está siendo orbitado es la Tierra. 
El radio de la Tierra es 6367.4447 kilómetros, y el valor GM de la Tierra es 398600.4418 km <sup>3</sup> s <sup>-2</sup> . 
Recuerda usar <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> si te atascas. Trate de emparejar el programa. Escribe tu propio código. 
</section>

## Instructions
<section id='instructions'> 

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: &#39; <code>orbitalPeriod([{name : &quot;sputnik&quot;, avgAlt : 35873.5553}])</code> debe devolver <code>[{name: &quot;sputnik&quot;, orbitalPeriod: 86400}]</code> .&#39;
    testString: 'assert.deepEqual(orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]), [{name: "sputnik", orbitalPeriod: 86400}], "<code>orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}])</code> should return <code>[{name: "sputnik", orbitalPeriod: 86400}]</code>.");'
  - text: &#39; <code>orbitalPeriod([{name: &quot;iss&quot;, avgAlt: 413.6}, {name: &quot;hubble&quot;, avgAlt: 556.7}, {name: &quot;moon&quot;, avgAlt: 378632.553}])</code> debe devolver <code>[{name : &quot;iss&quot;, orbitalPeriod: 5557}, {name: &quot;hubble&quot;, orbitalPeriod: 5734}, {name: &quot;moon&quot;, orbitalPeriod: 2377399}]</code> . &#39;
    testString: 'assert.deepEqual(orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}]), [{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}], "<code>orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}])</code> should return <code>[{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}]</code>.");'

```

</section>

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

<div id='js-seed'>

```js
function orbitalPeriod(arr) {
  var GM = 398600.4418;
  var earthRadius = 6367.4447;
  return arr;
}

orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]);
```

</div>



</section>

## Solution
<section id='solution'>


```js
function orbitalPeriod(arr) {
  var GM = 398600.4418;
  var earthRadius = 6367.4447;
  var TAU = 2 * Math.PI;
  return arr.map(function(obj) {
    return {
      name: obj.name,
      orbitalPeriod: Math.round(TAU * Math.sqrt(Math.pow(obj.avgAlt+earthRadius, 3)/GM))
    };
  });
}

orbitalPeriod([{name : "sputkin", avgAlt : 35873.5553}]);

```

</section>