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---
id: af2170cad53daa0770fabdea
title: Mutations
isRequired: true
challengeType: 5
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videoUrl: ''
localeTitle: Mutaciones
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---
## Description
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< section id = "description" > Devuelva verdadero si la cadena en el primer elemento de la matriz contiene todas las letras de la cadena en el segundo elemento de la matriz. Por ejemplo, < code > [" hello" , " Hello" ]< / code > , debería devolver verdadero porque todas las letras en la segunda cadena están presentes en la primera, sin distinción de mayúsculas y minúsculas. Los argumentos < code > [" hello" , " hey" ]< / code > deben devolver falso porque la cadena " hola" no contiene una " y" . Por último, < code > [" Alien" , " line" ]< / code > , debe devolver verdadero porque todas las letras en " line" están presentes en " Alien" . 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. Escribe tu propio código. < / section >
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## Instructions
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< section id = "instructions" >
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< / section >
## Tests
< section id = 'tests' >
```yml
tests:
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- text: '< code > mutation([" hello" , " hey" ])</ code > debe devolver falso.'
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testString: 'assert(mutation(["hello", "hey"]) === false, "< code > mutation(["hello", "hey"])< / code > should return false.");'
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- text: '< code > mutation([" hello" , " Hello" ])</ code > debe devolver verdadero.'
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testString: 'assert(mutation(["hello", "Hello"]) === true, "< code > mutation(["hello", "Hello"])< / code > should return true.");'
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- text: '< code > mutation([" zyxwvutsrqponmlkjihgfedcba" , " qrstu" ])</ code > debe devolver verdadero.'
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testString: 'assert(mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"]) === true, "< code > mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])< / code > should return true.");'
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- text: '< code > mutation([" Mary" , " Army" ])</ code > debe devolver la verdad.'
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testString: 'assert(mutation(["Mary", "Army"]) === true, "< code > mutation(["Mary", "Army"])< / code > should return true.");'
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- text: '< code > mutation([" Mary" , " Aarmy" ])</ code > debe devolver la verdad.'
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testString: 'assert(mutation(["Mary", "Aarmy"]) === true, "< code > mutation(["Mary", "Aarmy"])< / code > should return true.");'
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- text: '< code > mutation([" Alien" , " line" ])</ code > debe devolver true.'
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testString: 'assert(mutation(["Alien", "line"]) === true, "< code > mutation(["Alien", "line"])< / code > should return true.");'
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- text: '< code > mutation([" floor" , " for" ])</ code > debe devolver verdadero.'
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testString: 'assert(mutation(["floor", "for"]) === true, "< code > mutation(["floor", "for"])< / code > should return true.");'
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- text: '< code > mutation([" hello" , " neo" ])</ code > debe devolver falso.'
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testString: 'assert(mutation(["hello", "neo"]) === false, "< code > mutation(["hello", "neo"])< / code > should return false.");'
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- text: '< code > mutation([" voodoo" , " no" ])</ code > debe devolver falso.'
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testString: 'assert(mutation(["voodoo", "no"]) === false, "< code > mutation(["voodoo", "no"])< / code > should return false.");'
```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'js-seed' >
```js
function mutation(arr) {
return arr;
}
mutation(["hello", "hey"]);
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```
< / div >
< / section >
## Solution
< section id = 'solution' >
```js
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// solution required
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```
< / section >