Files
Shaun Hamilton c2a11ad00d feat: add 'back/front end' in curriculum (#42596)
* chore: rename APIs and Microservices to include "Backend" (#42515)

* fix typo

* fix typo

* undo change

* Corrected grammar mistake

Corrected a grammar mistake by removing a comma.

* change APIs and Microservices cert title

* update title

* Change APIs and Microservices certi title

* Update translations.json

* update title

* feat(curriculum): rename apis and microservices cert

* rename folder structure

* rename certificate

* rename learn Markdown

* apis-and-microservices -> back-end-development-and-apis

* update backend meta

* update i18n langs and cypress test

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

* fix: add development to front-end libraries (#42512)

* fix: added-the-word-Development-to-front-end-libraries

* fix/added-the-word-Development-to-front-end-libraries

* fix/added-word-development-to-front-end-libraries-in-other-related-files

* fix/added-the-word-Development-to-front-end-and-all-related-files

* fix/removed-typos-from-last-commit-in-index.md

* fix/reverted-changes-that-i-made-to-dependecies

* fix/removed xvfg

* fix/reverted changes that i made to package.json

* remove unwanted changes

* front-end-development-libraries changes

* rename backend certSlug and README

* update i18n folder names and keys

* test: add legacy path redirect tests

This uses serve.json from the client-config repo, since we currently use
that in production

* fix: create public dir before moving serve.json

* fix: add missing script

* refactor: collect redirect tests

* test: convert to cy.location for stricter tests

* rename certificate folder to 00-certificates

* change crowdin config to recognise new certificates location

* allow translations to be used

Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>

* add forwards slashes to path redirects

* fix cypress path tests again

* plese cypress

* fix: test different challenge

Okay so I literally have no idea why this one particular challenge
fails in Cypress Firefox ONLY. Tom and I paired and spun a full build
instance and confirmed in Firefox the page loads and redirects as
expected. Changing to another bootstrap challenge passes Cypress firefox
locally. Absolutely boggled by this.

AAAAAAAAAAAAAAA

* fix: separate the test

Okay apparently the test does not work unless we separate it into
a different `it` statement.

>:( >:( >:( >:(

Co-authored-by: Sujal Gupta <55016909+heysujal@users.noreply.github.com>
Co-authored-by: Noor Fakhry <65724923+NoorFakhry@users.noreply.github.com>
Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
2021-08-13 21:57:13 -05:00

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Markdown

---
id: 5a24c314108439a4d403615a
title: Elimina un elemento de un arreglo
challengeType: 6
forumTopicId: 301447
dashedName: remove-an-item-from-an-array
---
# --description--
Es hora de practicar la eliminación de elementos de un arreglo. Aquí también se puede utilizar el operador de propagación. Otros métodos útiles de JavaScript son `slice()` y `concat()`.
# --instructions--
El reductor y el creador de acción fueron modificados para eliminar un elemento de un arreglo en función del índice del elemento. Termina de escribir el reductor para que devuelva un nuevo arreglo de estados con el elemento en el índice específico eliminado.
# --hints--
El almacén Redux debe existir e inicializarse con un estado igual a `[0,1,2,3,4,5]`
```js
assert(
(function () {
const initialState = store.getState();
return (
Array.isArray(initialState) === true &&
DeepEqual(initialState, [0, 1, 2, 3, 4, 5])
);
})()
);
```
`removeItem` e `immutableReducer` deben ser funciones.
```js
assert(
typeof removeItem === 'function' && typeof immutableReducer === 'function'
);
```
Enviar el creador de acción `removeItem` debe eliminar elementos del estado y NO debe mutar el estado.
```js
assert(
(function () {
const initialState = store.getState();
const isFrozen = DeepFreeze(initialState);
store.dispatch(removeItem(3));
const state_1 = store.getState();
store.dispatch(removeItem(2));
const state_2 = store.getState();
store.dispatch(removeItem(0));
store.dispatch(removeItem(0));
store.dispatch(removeItem(0));
const state_3 = store.getState();
return (
isFrozen &&
DeepEqual(state_1, [0, 1, 2, 4, 5]) &&
DeepEqual(state_2, [0, 1, 4, 5]) &&
DeepEqual(state_3, [5])
);
})()
);
```
# --seed--
## --seed-contents--
```js
const immutableReducer = (state = [0,1,2,3,4,5], action) => {
switch(action.type) {
case 'REMOVE_ITEM':
// Don't mutate state here or the tests will fail
return
default:
return state;
}
};
const removeItem = (index) => {
return {
type: 'REMOVE_ITEM',
index
}
}
const store = Redux.createStore(immutableReducer);
```
# --solutions--
```js
const immutableReducer = (state = [0,1,2,3,4,5], action) => {
switch(action.type) {
case 'REMOVE_ITEM':
return [
...state.slice(0, action.index),
...state.slice(action.index + 1)
];
default:
return state;
}
};
const removeItem = (index) => {
return {
type: 'REMOVE_ITEM',
index
}
}
const store = Redux.createStore(immutableReducer);
```