* 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>
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id, title, challengeType, forumTopicId, dashedName
id | title | challengeType | forumTopicId | dashedName |
---|---|---|---|---|
5a24c314108439a4d4036159 | 在數組中使用擴展運算符 | 6 | 301452 | use-the-spread-operator-on-arrays |
--description--
ES6 中有助於在 Redux 中強制執行狀態不變性的一個解決方案是擴展運算符:...
。 擴展運算符具有很多的應用,其中一種非常適合通過一個已有的數組生成一個新數組。 這是相對較新的但常用的語法。 例如,如果你有一個數組 myArray
並寫:
let newArray = [...myArray];
newArray
現在是 myArray
的克隆。 兩個數組仍然分別存在於內存中。 如果你執行像 newArray.push(5)
這樣的變異, myArray
不會改變。 ...
有效將 myArray
中的值展開到一個新數組中。 要克隆數組,但在新數組中添加其他值,可以編寫 [...myArray, 'new value']
。 這將返回一個由 myArray
中的值和字符串 new value
(作爲最後一個值)組成的新數組。 擴展語法可以像這樣在數組組合中多次使用,但重要的是要注意它只是生成數組的淺拷貝副本。 也就是說,它只爲一維數組提供不可變的數組操作。
--instructions--
添加待辦事項時,使用 spread 運算符返回新的狀態副本。
--hints--
Redux store 應該在代碼編輯器中存在,並使用 ["Do not mutate state!"]
進行狀態初始化。
assert(
(function () {
const initialState = store.getState();
return (
Array.isArray(initialState) === true &&
initialState[0] === 'Do not mutate state!'
);
})()
);
addToDo
和 immutableReducer
都應該是函數。
assert(typeof addToDo === 'function' && typeof immutableReducer === 'function');
在 Redux store 上 dispatch 一個類型爲 ADD_TO_DO
的 aciton,應該添加一個 todo
項,並且不應該改變 state。
assert(
(function () {
const initialState = store.getState();
const isFrozen = DeepFreeze(initialState);
store.dispatch(addToDo('__TEST__TO__DO__'));
const finalState = store.getState();
const expectedState = ['Do not mutate state!', '__TEST__TO__DO__'];
return isFrozen && DeepEqual(finalState, expectedState);
})()
);
應使用擴展運算符返回新的 state。
(getUserInput) => assert(getUserInput('index').includes('...state'));
--seed--
--seed-contents--
const immutableReducer = (state = ['Do not mutate state!'], action) => {
switch(action.type) {
case 'ADD_TO_DO':
// Don't mutate state here or the tests will fail
return
default:
return state;
}
};
const addToDo = (todo) => {
return {
type: 'ADD_TO_DO',
todo
}
}
const store = Redux.createStore(immutableReducer);
--solutions--
const immutableReducer = (state = ['Do not mutate state!'], action) => {
switch(action.type) {
case 'ADD_TO_DO':
return [
...state,
action.todo
];
default:
return state;
}
};
const addToDo = (todo) => {
return {
type: 'ADD_TO_DO',
todo
}
}
const store = Redux.createStore(immutableReducer);