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Filter Active UserseasyComplete getActiveUsers so it returns only users whose active property is true.Arrays · ~5mCount Employees by RoleeasyComplete countEmployeesByRole so it returns an object mapping each role to the number of employees with that role.Objects · ~5mFind Employee by IDeasyComplete findEmployeeById so it returns the employee with the matching id, or undefined when no employee matches.Arrays · ~5mRemove Duplicate NumberseasyComplete removeDuplicates so it returns a new array containing only unique numbers, keeping the original order.Arrays · ~5mCalculate Average ScoreeasyComplete calculateAverage so it returns the average of all scores.Arrays · ~5mReverse a StringeasyComplete reverseString so it returns the input string reversed.Strings · ~5mCheck for PalindromeeasyComplete isPalindrome so it returns true when the string reads the same forwards and backwards (case-insensitive).Strings · ~5mSum of Even NumberseasyComplete sumEvens so it returns the sum of all even numbers in the array.Arrays · ~5mFizzBuzzeasyComplete fizzBuzz so it returns an array from 1 to n where multiples of 3 are "Fizz", multiples of 5 are "Buzz", and multiples of both are "FizzBuzz".Logic · ~5mGroup Products by CategorymediumComplete groupByCategory so it returns an object mapping each category to an array of product names in that category.Objects · ~8mFlatten a Nested ArraymediumComplete flatten so it returns a single-level array from an array nested to any depth.Arrays · ~8mChunk an ArraymediumComplete chunk so it splits the array into groups of the given size. The final group may be smaller.Arrays · ~8mSort Employees by AgemediumComplete sortByAge so it returns a new array of employees sorted by age ascending. Do not mutate the input array.Arrays · ~8mCount VowelseasyComplete countVowels so it returns the number of vowels (a, e, i, o, u) in the string, case-insensitive.Strings · ~5mFind the Longest WordmediumComplete longestWord so it returns the longest word in the sentence. If several words tie, return the first one.Strings · ~8mCapitalize Each WordeasyComplete capitalizeWords so it returns the sentence with the first letter of every word uppercased.Strings · ~5mFind Min and MaxeasyComplete minMax so it returns an object with the smallest and largest numbers, e.g. { min: 1, max: 9 }.Arrays · ~5mCount Character OccurrencesmediumComplete charCount so it returns an object mapping each character in the string to how many times it appears.Strings · ~8mSum Nested ValuesmediumComplete totalCartPrice so it returns the total price of the cart: sum of price × quantity for every item.Objects · ~8mMerge Two Sorted ArraysmediumComplete mergeSorted so it merges two arrays that are already sorted ascending into one sorted array.Arrays · ~8mCheck AnagramsmediumComplete isAnagram so it returns true when the two strings contain exactly the same letters (case-insensitive).Strings · ~8mPluck a PropertyeasyComplete pluck so it returns an array of the given property's value from every object.Objects · ~5mTwo SumhardComplete twoSum so it returns the indices of the two numbers that add up to the target, as [i, j] with i < j. Assume exactly one solution exists.Logic · ~12mBalanced BracketshardComplete isBalanced so it returns true when every opening bracket ( [ { has a matching closing bracket in the correct order.Logic · ~12mRunning TotalhardComplete runningTotal so it returns an array where each element is the sum of all numbers up to and including that position.Logic · ~12mFibonacci SequencemediumComplete fibonacci so it returns an array with the first n Fibonacci numbers, starting 0, 1.Logic · ~8mTitle from SlugeasyComplete unslug so it converts a-slug-like-this into "A Slug Like This".Strings · ~5mGreeting ComponenteasyComplete the Greeting component so it renders an <h1> saying "Hello, <name>!" using the name prop.React · ~5mItem Counter LabeleasyComplete CartSummary so it renders "<n> items in cart" where n is the length of the items prop array.React · ~5mConditional Status BadgeeasyComplete StatusBadge so it renders "Online" when the active prop is true and "Offline" when it is false.React · ~5mRender a User ListmediumComplete UserList so it renders a <ul> with one <li> per user showing the user's name.React · ~8mClick CountermediumComplete Counter so it renders "Count: <n>" and a <button> labeled "+" that increments the count on every click. Start at 0. Use the useState hook (available as React.useState).React · ~8mShow / Hide TogglehardComplete Toggle so it renders a <button> labeled "Toggle" and a message that switches between "Visible" and "Hidden" on each click. Start with "Visible". Use React.useState.React · ~12mActive UserseasyWrite a query that returns the id, name, and active status of active users. Order the rows by id.PostgreSQL · ~5mOrders for CustomereasyWrite a query that returns the id and total of every order placed by the customer named Maria. Order the rows by order id.PostgreSQL · ~5mCount by StatusmediumWrite a query that groups tickets by status and returns each status with its count as an integer column named count. Order the rows by status.PostgreSQL · ~8mRecent PostsmediumWrite a query that returns the id, title, and published_at date of posts published on or after 2024-01-01. Order newest posts first.PostgreSQL · ~8mInsert ReturningmediumInsert a product with id 1, name Mug, and price 9.5. Return the inserted row's id, name, and price.PostgreSQL · ~8mJoin and FiltermediumWrite a query that returns each customer name and matching order id for orders with a total greater than 100. Name the order id column order_id and order the rows by order id.PostgreSQL · ~8mUnique User EmaileasyWrite a Prisma schema with a User model. It must have an Int id marked @id and a String email marked @unique.Prisma · ~5mUser–Post 1-nmediumWrite User and Post models for a one-to-many relationship. User needs posts Post[]. Post needs authorId Int and author User with @relation(fields: [authorId], references: [id]).Prisma · ~8mRole EnummediumWrite a Role enum with USER and ADMIN values, then add a User model with a role field of type Role.Prisma · ~8mActive Users ArgseasyReturn the arguments object for prisma.user.findMany(...) that selects active users.Prisma · ~5mPosts With AuthormediumReturn the arguments object for prisma.post.findMany(...) that selects published posts and includes each post's author.Prisma · ~8mCreate Post ConnectmediumReturn the arguments object for prisma.post.create(...) that creates a post titled "Hi" and connects it to the author with id 1.Prisma · ~8mFilter Active UserseasyComplete get_active_users so it returns only users whose active property is true.Python · ~5mWord LengthseasyComplete word_lengths so it returns a list containing the length of each word.Python · ~5mGroup by CategorymediumComplete group_by_category so it returns a dict mapping each category to a list of product names in that category.Python · ~8mIs PalindromemediumComplete is_palindrome so it ignores non-alphanumeric characters and case when checking whether text is a palindrome.Python · ~8mTop N FrequenciesmediumComplete top_n_frequencies so it returns the top n [word, count] pairs ordered by count descending, then word ascending for ties.Python · ~8mFlatten Nested ListshardComplete flatten so it recursively flattens nested lists into a flat list of integers.Python · ~12mTyped Active UserseasyComplete getActiveUsers so it returns only users whose active property is true. Use the provided User type.TypeScript · ~5mPluck PropertyeasyComplete pluck so it returns an array of the given key's values from each item. The generic signature is already provided.TypeScript · ~5mApi Result MessagemediumComplete getMessage so it returns data when status is ok and message when status is error.TypeScript · ~8mCount By RolemediumComplete countByRole so it returns an object mapping each role to how many employees have that role.TypeScript · ~8mParse User IdeasyComplete parseUserId so it returns a number whether the input is a numeric string or already a number.TypeScript · ~5mOmit EmailmediumComplete omitEmail so it returns each user without the email field. Use the provided User type.TypeScript · ~8mFormat Full NameeasyComplete formatFullName so it returns a single display name from first and last. Trim each part, join with one space, and omit empty parts. If both are empty after trim, return an empty string.Strings · ~5mPick Completed TaskseasyComplete getCompletedTitles so it returns the title of every task whose done property is true, in the same order as the input.Arrays · ~5mBuild Query StringeasyComplete buildQueryString so it turns a plain object into a query string like `a=1&b=x`. Skip keys whose value is null or undefined. Convert other values with String(...). Do not add a leading `?`. Key order may follow Object.keys order.Objects · ~5mUnique TagseasyComplete uniqueTags so it flattens an array of tag arrays into one list of unique tags, preserving first-seen order.Arrays · ~5mApply DiscounteasyComplete applyDiscount so it returns price after a percent discount, rounded to 2 decimal places. Example: price 100 and percent 15 → 85.Logic · ~5mNewest Messages FirsteasyComplete sortMessagesNewestFirst so it returns a new array of messages sorted by createdAt descending (newest first). Do not mutate the input array. createdAt values are ISO date strings.Arrays · ~5mTyped Format Full NameeasyComplete formatFullName so it returns a display name from a Person. Trim each part, join with one space, and omit empty parts.TypeScript · ~5mActive Product NameseasyComplete getInStockNames so it returns the names of products where inStock is true, in input order.TypeScript · ~5mMerge SettingseasyComplete mergeSettings so it returns a full Settings object by shallow-merging defaults with overrides. Override keys win when provided.TypeScript · ~5mSafe DivideeasyComplete safeDivide so it returns a / b as a number, or null when b is 0.TypeScript · ~5mLabel By StatuseasyComplete statusLabel so it maps OrderStatus to a display string: pending → "Pending", shipped → "Shipped", cancelled → "Cancelled".TypeScript · ~5mPaginate ItemseasyComplete paginate so it returns a 1-based page slice of items. pageSize is how many items per page. If the page is out of range, return an empty array. Do not mutate the input.TypeScript · ~5m

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