1b:[{"uid":"136bm5n03clt","question":"Complete the missing code to transform an array of user records into a structured report:","createdAt":"$D2025-01-07T21:46:40.141Z","updatedAt":"$D2025-01-31T22:40:38.455Z","questionDate":"","answerResource":null,"correctAnswer":"136bm5n03clp","codeSnippet":"

const users = [\n    { id: 1, name: 'Alice', purchases: [100, 200, 300], status: 'active' },\n    { id: 2, name: 'Bob', purchases: [150, 50], status: 'inactive' },\n    { id: 3, name: 'Charlie', purchases: [400, 600, 100], status: 'active' }\n];\n\nfunction generateUserReport(users) {\n    return users\n        ._____________________\n        ._____________________\n        ._____________________\n}\n\nconst result = generateUserReport(users);\n// Should output: { activeUsers: 2, totalSpent: 1900, averageSpent: 316.67 }

","hint":"Think about the order of operations needed: filtering active users first, then calculating purchase totals, and finally aggregating the results.","dailyQuestion":false,"difficulty":"MEDIUM","customQuestion":false,"slug":"transform-user-records-array-into-structured-report","slugGenerated":true,"description":null,"title":"How to Transform User Data Array into Summary Report using JavaScript Array Methods","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false},{"uid":"136bm5n0g456","question":"How would you complete this function to implement a retry mechanism with exponential backoff for failed API calls?","createdAt":"$D2025-01-07T21:56:35.701Z","updatedAt":"$D2025-01-31T22:40:38.455Z","questionDate":"","answerResource":null,"correctAnswer":"136bm5n0g452","codeSnippet":"

async function fetchWithRetry(url, options = {}, maxRetries = 3) {\n    let retryCount = 0;\n    let lastError = null;\n\n    const calculateBackoff = (attempt) => {\n        return Math.min(1000 * Math.pow(2, attempt), 10000);\n    };\n\n    while (retryCount <= maxRetries) {\n        try {\n            _______________________________\n            _______________________________\n            _______________________________\n            return response;\n        } catch (error) {\n            lastError = error;\n            if (retryCount === maxRetries) break;\n            \n            const backoffTime = calculateBackoff(retryCount);\n            retryCount++;\n            \n            await new Promise(resolve => setTimeout(resolve, backoffTime));\n        }\n    }\n    \n    throw new Error(`Failed after ${maxRetries} retries: ${lastError.message}`);\n}

","hint":"Think about proper error handling and response validation in the context of HTTP requests.","dailyQuestion":false,"difficulty":"MEDIUM","customQuestion":false,"slug":"implement-retry-mechanism-exponential-backoff-api-calls","slugGenerated":true,"description":null,"title":"Implementing Exponential Backoff Retry Mechanism for Failed API Fetch Requests in JavaScript","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false},{"uid":"136bm5n0ibhg","question":"What's the correct implementation to create a reactive object that logs all property access and modifications?","createdAt":"$D2025-01-07T21:58:18.528Z","updatedAt":"$D2025-01-31T22:40:38.455Z","questionDate":"","answerResource":null,"correctAnswer":"136bm5n0ibhd","codeSnippet":"

function createReactiveObject(target) {\n    const handlers = {\n        get(target, property, receiver) {\n            _______________________________\n        },\n        set(target, property, value, receiver) {\n            _______________________________\n            _______________________________\n        }\n    };\n\n    return new Proxy(target, handlers);\n}\n\nconst user = createReactiveObject({\n    name: 'John',\n    age: 30\n});\n\nuser.name = 'Jane';  // Should log modification\nconsole.log(user.age);  // Should log access

","hint":"Consider how to properly handle property access and modification while avoiding infinite loops.","dailyQuestion":false,"difficulty":"HARD","customQuestion":false,"slug":"create-reactive-object-proxy-logging-properties","slugGenerated":true,"description":null,"title":"How to Create a JavaScript Proxy Object with Property Access Tracking and Logging","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false}]

How to Get the Last Element of an Array in JavaScript: Different Methods Explained

Hint

Related Questions