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---
id: af7588ade1100bde429baf20
title: Missing letters
isRequired: true
challengeType: 5
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videoUrl: ''
localeTitle: Cartas perdidas
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---
## Description
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< section id = "description" > Encuentra la letra que falta en el rango de letras aprobadas y devuélvela. Si todas las letras están presentes en el rango, devuelve indefinido. 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 >
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## Instructions
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< section id = "instructions" >
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< / section >
## Tests
< section id = 'tests' >
```yml
tests:
- text: < code > fearNotLetter(" abce" )</ code > debe devolver " d" .
testString: 'assert.deepEqual(fearNotLetter("abce"), "d", "< code > fearNotLetter("abce")< / code > should return "d".");'
- text: < code > fearNotLetter(" abcdefghjklmno" )</ code > debe devolver " i" .
testString: 'assert.deepEqual(fearNotLetter("abcdefghjklmno"), "i", "< code > fearNotLetter("abcdefghjklmno")< / code > should return "i".");'
- text: < code > fearNotLetter(" stvwx" )</ code > debería devolver " u" .
testString: 'assert.deepEqual(fearNotLetter("stvwx"), "u", "< code > fearNotLetter("stvwx")< / code > should return "u".");'
- text: < code > fearNotLetter(" bcdf" )</ code > debe devolver " e" .
testString: 'assert.deepEqual(fearNotLetter("bcdf"), "e", "< code > fearNotLetter("bcdf")< / code > should return "e".");'
- text: < code > fearNotLetter(" abcdefghijklmnopqrstuvwxyz" )</ code > debe devolver undefined.
testString: 'assert.isUndefined(fearNotLetter("abcdefghijklmnopqrstuvwxyz"), "< code > fearNotLetter("abcdefghijklmnopqrstuvwxyz")< / code > should return undefined.");'
```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'js-seed' >
```js
function fearNotLetter(str) {
return str;
}
fearNotLetter("abce");
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```
< / div >
< / section >
## Solution
< section id = 'solution' >
```js
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// solution required
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```
< / section >