1c:[{"uid":"136bm5n03clt","question":"Complete the missing code to transform an array of user records into a structured report:","createdAt":"$D2025-01-07T21:46:40.141Z","updatedAt":"$D2025-03-30T16:28:25.651Z","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,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1f3qm5k08m6o","question":"In a social media app, you need to implement a feature that processes user comments. What will the output be when this code runs?","createdAt":"$D2025-01-05T19:27:27.307Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1f3qm5k08m6k","codeSnippet":"

const comments = [\n  { id: 1, text: \"Great post!\", likes: 5 },\n  { id: 2, text: \"Thanks!\", likes: 3 },\n  { id: 3, text: \"Interesting\", likes: 7 }\n];\n\nconst processComments = comments.reduce((acc, comment) => {\n  if (comment.likes > 4) {\n    acc.popular.push(comment.text);\n  } else {\n    acc.regular.push(comment.text);\n  }\n  return acc;\n}, { popular: [], regular: [] });\n\nconsole.log(processComments);

","hint":"Focus on the condition in the if statement and how reduce accumulates results","dailyQuestion":false,"difficulty":"MEDIUM","customQuestion":false,"slug":"process-comments-by-likes-using-reduce","slugGenerated":true,"description":null,"title":"How to Filter and Categorize Comments by Likes Using Array Reduce in JavaScript","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1f3qm5k0cpoh","question":"You're developing an e-commerce checkout system that needs to process multiple discount codes. What's wrong with this implementation?","createdAt":"$D2025-01-05T19:30:38.461Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1f3qm5k0cpod","codeSnippet":"

async function applyDiscounts(cart, discountCodes) {\n    let totalDiscount = 0;\n    \n    discountCodes.forEach(async (code) => {\n        const discount = await fetchDiscountValue(code);\n        totalDiscount += discount;\n    });\n    \n    return {\n        ...cart,\n        totalDiscount,\n        finalPrice: cart.originalPrice - totalDiscount\n    };\n}\n\n// Usage\nconst cart = { originalPrice: 100 };\nconst codes = ['SUMMER', 'WELCOME'];\nconsole.log(await applyDiscounts(cart, codes));

","hint":"Think about how forEach handles promises differently from other array methods","dailyQuestion":false,"difficulty":"MEDIUM","customQuestion":false,"slug":"async-discount-codes-foreach-promise-issue","slugGenerated":true,"description":null,"title":"Fix Async forEach Loop Not Waiting for Discount Calculations in JavaScript Shopping Cart","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1f3qm5k0fb73","question":"You're building a content filtering system. What will this code output when processing user-generated content?","createdAt":"$D2025-01-05T19:32:39.659Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1f3qm5k0fb6z","codeSnippet":"

const filterContent = (text) => {\n  const words = text.toLowerCase().split(' ');\n  const result = words.some((word, index) => {\n    if (word === 'and') {\n      return words[index - 1] === 'click' || \n             words[index + 1] === 'subscribe';\n    }\n    return false;\n  });\n  return result;\n};\n\nconsole.log(filterContent(\"Please click and subscribe to my channel\"));\nconsole.log(filterContent(\"Click here and watch\"));\nconsole.log(filterContent(\"Like and comment below\"));

","hint":"Pay attention to the conditions in the some() method and how adjacent words are checked","dailyQuestion":false,"difficulty":"EASY","customQuestion":false,"slug":"content-filter-click-and-subscribe-detection","slugGenerated":true,"description":null,"title":"How to Detect \"Click and Subscribe\" Patterns in Text Using JavaScript Array Methods","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1f3qm5k0pl4o","question":"You're debugging a financial dashboard where transaction totals aren't updating correctly. The code processes multiple currency conversions asynchronously. What's the fundamental issue with this implementation?","createdAt":"$D2025-01-05T19:40:39.092Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1f3qm5k0pl4m","codeSnippet":"

async function calculatePortfolioValue(transactions) {\n  let totalUSD = 0;\n  const exchangeRates = new Map();\n\n  async function getExchangeRate(currency) {\n    if (exchangeRates.has(currency)) {\n      return exchangeRates.get(currency);\n    }\n    const response = await fetch(`/api/rates/${currency}`);\n    const rate = await response.json();\n    exchangeRates.set(currency, rate.value);\n    return rate.value;\n  }\n\n  transactions.forEach(async (tx) => {\n    const rate = await getExchangeRate(tx.currency);\n    const valueUSD = tx.amount * rate;\n    totalUSD += valueUSD;\n  });\n\n  return {\n    total: totalUSD,\n    timestamp: Date.now()\n  };\n}\n\n// Usage\nconst dashboard = {\n  async updateTotals(transactions) {\n    const result = await calculatePortfolioValue(transactions);\n    this.setState({ portfolioValue: result.total });\n  }\n};

","hint":"Consider how Array methods handle asynchronous callbacks.","dailyQuestion":false,"difficulty":"HARD","customQuestion":false,"slug":"async-currency-conversion-totals-not-updating-correctly","slugGenerated":true,"description":null,"title":"Fix Async forEach Loop in Currency Conversion for Portfolio Value Calculation","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1f3qm5k1cano","question":"You're building a social media dashboard that needs to process user engagement data. Given an array of post interactions, which method chain would correctly calculate the average engagement rate (likes + comments / total posts) for posts with more than 100 views?","createdAt":"$D2025-01-05T19:58:18.607Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1f3qm5k1canl","codeSnippet":"

const postMetrics = [\n  { id: 1, likes: 45, comments: 12, views: 102 },\n  { id: 2, likes: 80, comments: 5, views: 98 },\n  { id: 3, likes: 32, comments: 24, views: 215 },\n  { id: 4, likes: 60, comments: 8, views: 134 },\n  { id: 5, likes: 25, comments: 3, views: 88 }\n];

","hint":"Think about the order of operations - you'll need to first isolate the relevant posts before calculating the engagement rate.","dailyQuestion":false,"difficulty":"EASY","customQuestion":false,"slug":"calculate-average-engagement-rate-social-posts","slugGenerated":true,"description":null,"title":"Calculate Average Engagement Rate for Posts with High Views using JavaScript Array Methods","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1gpim617uql7","question":"Your e-commerce platform needs to implement a flexible sorting system for products. The current code sorts products by price, but customers are complaining about inconsistent results. What's the correct way to modify the sort implementation?","createdAt":"$D2025-01-17T20:32:41.750Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1gpim617uql5","codeSnippet":"

const products = [\n  { name: \"Laptop\", price: 999.99, rating: 4.5, stock: 12 },\n  { name: \"Phone\", price: 699.99, rating: 4.8, stock: 8 },\n  { name: \"Tablet\", price: 499.50, rating: 4.2, stock: 0 },\n  { name: \"Smartwatch\", price: 199.99, rating: 4.6, stock: 5 }\n];\n\nfunction sortProducts(items) {\n  return items.sort((a, b) => {\n    // Missing sorting logic\n  });\n}\n\nconsole.log(sortProducts(products));

","hint":"Consider how to handle equal values and ensure consistent sorting across different browsers.","dailyQuestion":false,"difficulty":"MEDIUM","customQuestion":false,"slug":"implement-flexible-product-sorting-javascript","slugGenerated":true,"description":null,"title":"Dynamic Product Sorting Implementation","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1gpim617z6vo","question":"our application needs to sort user names that include international characters (é, ñ, ü, etc.). The current implementation isn't handling these correctly. Which sorting implementation will properly handle international character sets?","createdAt":"$D2025-01-17T20:36:09.487Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1gpim617z6vl","codeSnippet":"

const users = [\n  \"José Rodriguez\",\n  \"Andre Smith\",\n  \"Björn Österberg\",\n  \"Zoë Williams\",\n  \"Núria Garcia\",\n  \"Adam Jones\"\n];\n\nfunction sortUserNames(names, locale = 'en') {\n  return names.sort(/* Missing comparator function */);\n}\n\nconsole.log(sortUserNames(users, 'es'));

","hint":"Consider how different languages handle character ordering and what built-in JavaScript methods support internationalization.","dailyQuestion":false,"difficulty":"HARD","customQuestion":false,"slug":"sort-international-names-javascript-localecompare","slugGenerated":true,"description":null,"title":"Internationalization-Aware String Sorting","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1gpim6181ox1","question":"You need to sort an array of software version numbers following semantic versioning (major.minor.patch). Which implementation correctly sorts version numbers like \"2.0.1\" vs \"2.1.0\" vs \"2.0.12\"?","createdAt":"$D2025-01-17T20:38:06.177Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"1gpim6181owz","codeSnippet":"

const versions = [\n  \"1.0.0\",\n  \"2.0.0\",\n  \"1.9.1\",\n  \"1.10.0\",\n  \"2.0.1\",\n  \"1.8.12\",\n  \"1.9.2\"\n];\n\nfunction sortVersions(versions) {\n  return versions.sort(/* Missing comparator function */);\n}\n\nconsole.log(sortVersions(versions));

","hint":"Think about how version numbers should be compared component by component (major, minor, patch).","dailyQuestion":false,"difficulty":"HARD","customQuestion":false,"slug":"sort-semantic-version-numbers-javascript","slugGenerated":true,"description":null,"title":"Semantic Version Sorting Algorithm","questionType":"MULTIPLE_CHOICE","expectedParams":null,"functionName":null,"returnType":null,"testCases":null,"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null},{"uid":"1is6m6cotprk","question":"Sum of an Array","createdAt":"$D2025-01-25T21:13:15.441Z","updatedAt":"$D2025-03-30T16:28:25.651Z","questionDate":"","answerResource":null,"correctAnswer":"-","codeSnippet":"/**\n * Calculates the sum of all numbers in an array.\n *\n * @param {number[]} numbers - The array of numbers to sum.\n * @returns {number} - The sum of all numbers in the array.\n *\n * @example\n * sumArray([1, 2, 3, 4, 5]); // ➞ 15\n * sumArray([10, -5, 7]); // ➞ 12\n * sumArray([]); // ➞ 0\n */\nfunction sumArray(...numbers) {\n // your code here\n}","hint":"- **Loop Through the Array:** Use a `for` loop or the `.reduce()` method to sum the elements. \n- **Handle Empty Arrays:** If the array is empty, return `0`. \n- **Consider Negative Numbers:** Ensure your function correctly adds both positive and negative values. ","dailyQuestion":false,"difficulty":"EASY","customQuestion":false,"slug":"for-loop-sum-of-array","slugGenerated":true,"description":"In this challenge, you are required to write a function that takes an array of numbers and returns the sum of all the elements. \n\nArrays are commonly used to store collections of data, and summing their values is a basic operation used in many real-world applications, such as calculating totals, averages, and financial figures. \n\n### Example Usage \n```js sumArray([1, 2, 3, 4, 5]); // ➞ 15 \nsumArray([10, -5, 7]); // ➞ 12 \nsumArray([]); // ➞ 0 \nsumArray([100]); // ➞ 100 \n``` \n\n### Constraints \n- The input will always be an array of numbers. \n- If the array is empty, return '0'. \n- The array may contain both positive and negative numbers. \n- The function should handle arrays of any length, including a single element.","title":"Sum of an Array","questionType":"CODING_CHALLENGE","expectedParams":null,"functionName":null,"returnType":null,"testCases":[{"input":[1,2,3,4,5],"expected":15},{"input":[10,-5,7],"expected":12},{"input":[],"expected":0},{"input":[100],"expected":100},{"input":[-1,-2,-3,-4],"expected":-10},{"input":[0,0,0],"expected":0}],"nextQuestionSlug":null,"previousQuestionSlug":null,"isPremiumQuestion":false,"afterQuestionInfo":null,"aiTimeToComplete":null}]