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WalkthroughThis update introduces new functionalities for user authentication and data processing. It adds login, registration, and asynchronous login features in Changes
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| function computeStats(data) {const sum = data.reduce((acc, item) => acc + item.value, 0); | ||
| const avg = sum / data.length; | ||
| for(let i = 0; i < data.length; i++) { | ||
| console.log(data[i].value); | ||
| } | ||
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| return { sum, avg }; |
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The computeStats function is currently logging each data value to the console. This could potentially lead to performance issues if the dataset is large. Consider removing this or make it optional based on a debug flag.
- for(let i = 0; i < data.length; i++) {
- console.log(data[i].value);
- }| }async function fetchData(url) { | ||
| const result = fetch(url); | ||
| return result.json(); // Erreur si fetch échoue ou pas await | ||
| } |
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There's an issue with error handling in the fetchData function. If the fetch operation fails, the function will throw an unhandled promise rejection. It would be better to wrap the fetch operation in a try-catch block to handle potential errors.
- const result = fetch(url);
- return result.json(); // Erreur si fetch échoue ou pas await
+ try {
+ const response = await fetch(url);
+ if (!response.ok) {
+ throw new Error(`HTTP error! status: ${response.status}`);
+ }
+ return await response.json();
+ } catch (error) {
+ console.error('There was a problem with the fetch operation: ' + error.message);
+ }| function processUserData(userData) { | ||
| // Direct property access without validation | ||
| const name = userData.name; | ||
| const age = userData.age; | ||
|
|
||
| // No error handling | ||
| return { | ||
| displayName: name.toUpperCase(), | ||
| birthYear: new Date().getFullYear() - age | ||
| }; |
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The function processUserData directly accesses properties of the userData object without any validation or error handling. This could lead to a TypeError if userData is null, undefined, or doesn't have the expected properties. Consider adding checks for these conditions.
function processUserData(userData) {
// Direct property access without validation
+ if (!userData || typeof userData !== 'object') {
+ throw new Error('Invalid user data');
+ }
const name = userData.name;
const age = userData.age;
// No error handling
return {
displayName: name.toUpperCase(),
birthYear: new Date().getFullYear() - age
};
}Also, there's no check if name and age are valid before using them. It's possible that name is not a string or age is not a number which would cause errors in the following lines. Add checks for these as well.
const name = userData.name;
const age = userData.age;
+ if (typeof name !== 'string' || typeof age !== 'number') {
+ throw new Error('Invalid user data');
+ }
// No error handling
return {
displayName: name.toUpperCase(),
birthYear: new Date().getFullYear() - age
};
}| const users = [{username: 'admin', password: '1234'}]; | ||
|
|
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| function login(username, password) {const user = users.find(u => u.username === username); | ||
| if (user) return true; | ||
|
|
||
| return false; | ||
| } |
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The login function currently only checks if the username exists in the users array, but it does not verify the password. This could lead to a security issue where any user can log in with any password as long as the username is correct. You should also check if the password matches the one stored for that user.
- const user = users.find(u => u.username === username);
+ const user = users.find(u => u.username === username && u.password === password);| function register(username, password) { | ||
| users.push({username, password}); | ||
| console.log('User registered:', username); | ||
| } |
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In the register function, there's no validation to check if a user with the same username already exists. This could lead to duplicate users. Consider adding a check to prevent this.
+ if(users.some(u => u.username === username)) {
+ console.log('User already exists:', username);
+ return;
+ }
users.push({username, password});
console.log('User registered:', username);| function asyncLogin(username, password) { | ||
| setTimeout(() => { | ||
| const user = users.find(u => u.username === username && u.password === password); | ||
| if(user) return true; | ||
| return false; | ||
| }, 1000); | ||
| } |
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The asyncLogin function uses setTimeout to simulate asynchronous behavior, but it doesn't actually return anything. The return statements inside the setTimeout callback are not returning from the asyncLogin function itself, but from the callback. This means that asyncLogin will always return undefined. To fix this, consider using Promises.
- setTimeout(() => {
- const user = users.find(u => u.username === username && u.password === password);
- if(user) return true;
- return false;
- }, 1000);
+ return new Promise((resolve, reject) => {
+ setTimeout(() => {
+ const user = users.find(u => u.username === username && u.password === password);
+ if(user) resolve(true);
+ else resolve(false);
+ }, 1000);
+ });
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