2021-02-06 04:42:36 +00:00
|
|
|
---
|
|
|
|
id: bd7123c9c451eddfaeb5bdef
|
2021-02-21 15:49:16 +00:00
|
|
|
title: Utilice la notación de corchete para encontrar el último carácter en una cadena
|
2021-02-06 04:42:36 +00:00
|
|
|
challengeType: 1
|
|
|
|
videoUrl: 'https://scrimba.com/c/cBZQGcv'
|
|
|
|
forumTopicId: 18342
|
|
|
|
dashedName: use-bracket-notation-to-find-the-last-character-in-a-string
|
|
|
|
---
|
|
|
|
|
|
|
|
# --description--
|
|
|
|
|
2021-02-21 15:49:16 +00:00
|
|
|
Con el fin de obtener la última letra de una cadena, puede restar uno a la longitud del texto.
|
2021-02-06 04:42:36 +00:00
|
|
|
|
2021-02-21 15:49:16 +00:00
|
|
|
Por ejemplo, si `var firstName = "Charles"`, puedes obtener el valor de la última letra de la cadena usando `firstName[firstName.length - 1]`.
|
2021-02-06 04:42:36 +00:00
|
|
|
|
2021-02-21 15:49:16 +00:00
|
|
|
Ejemplo:
|
2021-02-06 04:42:36 +00:00
|
|
|
|
|
|
|
```js
|
|
|
|
var firstName = "Charles";
|
|
|
|
var lastLetter = firstName[firstName.length - 1]; // lastLetter is "s"
|
|
|
|
```
|
|
|
|
|
|
|
|
# --instructions--
|
|
|
|
|
2021-02-21 15:49:16 +00:00
|
|
|
Usa <dfn>notación de corchetes</dfn> para encontrar el último carácter en la variable `lastName`.
|
2021-02-06 04:42:36 +00:00
|
|
|
|
2021-02-21 15:49:16 +00:00
|
|
|
**Sugerencia:** Intenta mirar el ejemplo de arriba si te quedas atascado.
|
2021-02-06 04:42:36 +00:00
|
|
|
|
|
|
|
# --hints--
|
|
|
|
|
2021-02-21 15:49:16 +00:00
|
|
|
`lastLetterOfLastName` debe ser "e".
|
2021-02-06 04:42:36 +00:00
|
|
|
|
|
|
|
```js
|
|
|
|
assert(lastLetterOfLastName === 'e');
|
|
|
|
```
|
|
|
|
|
2021-02-21 15:49:16 +00:00
|
|
|
Debes usar `.length` para obtener la última letra.
|
2021-02-06 04:42:36 +00:00
|
|
|
|
|
|
|
```js
|
|
|
|
assert(code.match(/\.length/g).length > 0);
|
|
|
|
```
|
|
|
|
|
|
|
|
# --seed--
|
|
|
|
|
|
|
|
## --after-user-code--
|
|
|
|
|
|
|
|
```js
|
|
|
|
(function(v){return v;})(lastLetterOfLastName);
|
|
|
|
```
|
|
|
|
|
|
|
|
## --seed-contents--
|
|
|
|
|
|
|
|
```js
|
|
|
|
// Setup
|
|
|
|
var lastName = "Lovelace";
|
|
|
|
|
|
|
|
// Only change code below this line
|
|
|
|
var lastLetterOfLastName = lastName; // Change this line
|
|
|
|
```
|
|
|
|
|
|
|
|
# --solutions--
|
|
|
|
|
|
|
|
```js
|
|
|
|
var lastName = "Lovelace";
|
|
|
|
var lastLetterOfLastName = lastName[lastName.length - 1];
|
|
|
|
```
|