Sie müssen ein Online-Umfragesystem entwerfen und implementieren. Das System sollte es Benutzern ermöglichen, Umfragen zu erstellen, zu verwalten und daran teilzunehmen. Jede Umfrage besteht aus einer Frage und mehreren Antwortmöglichkeiten. Benutzer können an Umfragen teilnehmen und die Ergebnisse anzeigen.
Umfrage erstellen :
UpdateUmfrage :
löschenPoll :
voteInPoll :
viewPollResults :
{
"pollId": "123",
"question": "What is your favorite color?",
"options": ["Red", "Blue", "Green", "Yellow"],
"createdAt": "2024-07-11T00:00:00Z"
}
{
"pollId": "123",
"userId": "user1",
"option": "Red",
"timestamp": "2024-07-11T01:00:00Z"
}
Dieser Code definiert ein grundlegendes Abfragesystem mithilfe von JavaScript-Klassen. Es ermöglicht die Erstellung, Verwaltung und Abstimmung in Umfragen. Lassen Sie uns jeden Teil des Codes aufschlüsseln:
createPoll(question, options)
updatePoll(pollId, question, options)
deletePoll(pollId)
voteInPoll(pollId, userId, option)
viewPollResults(pollId)
This implementation provides a basic but functional polling system, handling common scenarios such as poll creation, updating, voting, and deletion.
class Poll {
constructor(id, question, options) {
this.pollId = id;
this.question = question;
this.options = options;
this.createdAt = new Date();
}
}
class Vote {
constructor(pollId, userId, option) {
this.pollId = pollId;
this.userId = userId;
this.option = option;
this.timestamp = new Date();
}
}
class PollManager {
constructor() {
this.polls = new Map();
this.pollResults = new Map();
this.userVotes = new Map();
}
createPoll(question, options) {
const pollId = (this.polls.size + 1).toString();
const poll = new Poll(pollId, question, options);
this.polls.set(pollId, poll);
const result = new Map();
options.forEach(option => result.set(option, 0));
this.pollResults.set(pollId, result);
return pollId;
}
updatePoll(pollId, question, options) {
const poll = this.polls.get(pollId);
if (poll) {
poll.question = question;
poll.options = options;
// Update results for the new options
const result = new Map();
options.forEach(option => result.set(option, 0));
this.pollResults.set(pollId, result);
return "Poll updated successfully.";
}
return "Poll not found.";
}
deletePoll(pollId) {
if (this.polls.delete(pollId)) {
this.pollResults.delete(pollId);
this.userVotes.delete(pollId);
return "Poll deleted successfully.";
}
return "Poll not found.";
}
voteInPoll(pollId, userId, option) {
const poll = this.polls.get(pollId);
if (poll) {
if (!this.userVotes.has(pollId)) {
this.userVotes.set(pollId, new Map());
}
const userVote = this.userVotes.get(pollId);
if (userVote.get(userId)) {
return "User has already voted.";
}
const result = this.pollResults.get(pollId);
if (result.has(option)) {
result.set(option, result.get(option) + 1);
userVote.set(userId, true);
return "Vote cast successfully.";
} else {
return "Invalid option.";
}
}
return "Poll not found.";
}
viewPollResults(pollId) {
const results = this.pollResults.get(pollId);
if (results) {
return Array.from(results.entries());
}
return "Poll not found.";
}
}
// Example usage
const pollManager = new PollManager();
// Creating a poll
const pollId = pollManager.createPoll("What is your favorite color?", ["Red", "Blue", "Green", "Yellow"]);
console.log("Poll created with ID:", pollId);
// Voting in the poll
let voteMessage = pollManager.voteInPoll(pollId, "user1", "Red");
console.log(voteMessage);
voteMessage = pollManager.voteInPoll(pollId, "user2", "Blue");
console.log(voteMessage);
voteMessage = pollManager.voteInPoll(pollId, "user1", "Green");
console.log(voteMessage); // Should inform the user has already voted
// Viewing poll results
let results = pollManager.viewPollResults(pollId);
console.log("Poll results for poll ID", pollId, ":", results);
// Updating the poll
let updateMessage = pollManager.updatePoll(pollId, "What is your favorite primary color?", ["Red", "Blue", "Yellow"]);
console.log(updateMessage);
// Voting in the updated poll
voteMessage = pollManager.voteInPoll(pollId, "user3", "Yellow");
console.log(voteMessage);
// Viewing updated poll results
results = pollManager.viewPollResults(pollId);
console.log("Updated poll results for poll ID", pollId, ":", results);
// Deleting the poll
let deleteMessage = pollManager.deletePoll(pollId);
console.log(deleteMessage);
// Attempting to view results of a deleted poll
results = pollManager.viewPollResults(pollId);
if (typeof results === "string") {
console.log(results);
}
// Response
// Poll created with ID: 1
// Vote cast successfully.
// Vote cast successfully.
// User has already voted.
// Poll results for poll ID 1 : [['Red', 1], ['Blue', 1], ['Green', 0], ['Yellow', 0]]
// Poll updated successfully.
// Vote cast successfully.
// Updated poll results for poll ID 1 : [['Red', 0], ['Blue', 0], ['Yellow', 1]]
// Poll deleted successfully.
// Poll not found.
Note: Please follow for more detail & Enchanced version of this article with DB, API & other system Design Concept.
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Hastag: SystemDesignWithZeeshanAli
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Git: https://github.com/ZeeshanAli-0704/SystemDesignWithZeeshanAli
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