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+/*
+ * ======================================================
+ *  ADVANCED JAVASCRIPT ASSIGNMENT
+ *  Arrays, Objects, Callbacks, Promises, Async/Await, Timers
+ *  Each question has space for writing the solution.
+ *  Create name of your folder name , and then answer these
+     questions in seperate file. 
+ * ======================================================
+ */
+
+//
+// ======================================================
+//                CATEGORY 1: MEDIUM LEVEL
+// ======================================================
+//
+
+// ---------- ARRAYS (1–5) ----------
+
+// 1. Write a function that returns the second largest number in an array.
+// Solution:
+const sc = (arr)=>{
+    mx = arr[0]
+    for(let i = 0; i < arr.length;i++){
+        if (arr[i] > mx){
+            mx = arr[i]
+        }
+        i1=i
+    }
+    arr.splice(i1,1)
+    mx2 = arr[0]
+    for(let i = 0;i<arr.length;i++){
+        if (arr[i]>mx2){
+            mx2 = arr[i]
+        }
+    }
+    return mx2
+}
+
+// 2. Return all strings with length > 4 from an array.
+// Solution:
+function filterLongStrings(strings) {
+  return strings.filter(str => str.length > 4);
+}
+
+// 3. Convert an array of numbers to their squares using .map().
+// Solution:
+function squareNumbers(numbers) {
+  return numbers.map(n => n * n);
+}
+
+// 4. Remove duplicate values from an array (without using Set).
+// Solution:
+function removeDuplicates(array) {
+  const unique = [];
+
+  for (const item of array) {
+    if (!unique.includes(item)) {
+      unique.push(item);
+    }
+  }
+
+  return unique;
+}
+
+// 5. Count how many times each element appears in an array (return an object).
+// Solution:
+function countOccurrences(array) {
+  const counts = {};
+
+  for (const value of array) {
+    if (counts[value]) {
+      counts[value]++;
+    } else {
+      counts[value] = 1;
+    }
+  }
+
+  return counts;
+}
+
+// ---------- OBJECTS (6–10) ----------
+
+// 6. Write a function that returns all keys of an object in an array.
+// Solution:
+function getObjectKeys(obj) {
+  return Object.keys(obj);
+}
+
+// 7. Given an object of item prices, return the total cost.
+// Solution:
+function getTotalCost(priceList) {
+  let total = 0;
+
+  for (const item in priceList) {
+    total += priceList[item];
+  }
+
+  return total;
+}
+
+// 8. Write a function that checks if an object is empty.
+// Solution:
+function isObjectEmpty(obj) {
+  return Object.keys(obj).length === 0;
+}
+
+// 9. Merge two objects without using the spread operator.
+// Solution:
+function mergeObjects(obj1, obj2) {
+  const result = {};
+
+  Object.assign(result, obj1);
+  Object.assign(result, obj2);
+
+  return result;
+}
+
+// 10. Create an object with a method that returns "Hello, <name>" using this.
+// Solution:
+const person = {
+  name: "Boss",
+  greet() {
+    return `Hello, ${this.name}`;
+  }
+};
+
+
+
+
+//
+// ======================================================
+//                   CATEGORY 2: HARD LEVEL
+// ======================================================
+//
+
+// ---------- CALLBACKS (1–2) ----------
+
+// 1. Write a function repeatTask(n, task) that runs a callback n times.
+// Solution:
+
+// 2. Simulate fetching a user with a callback after a delay.
+// Solution:
+
+// ---------- PROMISES (3–5) ----------
+
+// 3. Convert a callback-based function into a promise-based one.
+// Solution:
+
+
+// 4. Write loadData() that resolves in 2s or rejects randomly (50% chance).
+// Solution:
+
+
+
+// 5. Chain: loadUser → loadPosts → loadComments.
+// Each returns a promise.
+// Solution:
+
+
+// ---------- ASYNC/AWAIT (6–7) ----------
+
+// 6. Rewrite question 5 using async/await instead of .then().
+// Solution:
+
+// 7. Write an async function that fetches two promises in parallel.
+// Solution:
+
+
+
+// ---------- TIMERS + LOGIC (8–10) ----------
+
+// 8. Print numbers from 10 down to 1 using a timer, then print "Done".
+// Solution:
+
+
+// 9. Implement a throttled function that runs once every 2 seconds.
+// Solution:
+
+
+// 10. Implement a debounced function that runs only when typing stops for 500ms.
+// Solution:
+
+
+//
+// ======================================================
+//                CATEGORY 3: BONUS QUESTIONS
+// ======================================================
+//
+
+// ---------- ARRAYS & OBJECTS (1–3) ----------
+
+// 1. Convert an array of users into an object using their id as the key.
+// Solution:
+const usersById = {};
+for (const user of users) {
+  usersById[user.id] = user;
+}
+
+
+// 2. Given students with marks, return the top 3 scorers.
+// Solution:
+const three = (res) => {
+  const arr = [...res];
+
+  for (let i = 0; i < arr.length - 1; i++) {
+    let maxIdx = i;
+    for (let j = i + 1; j < arr.length; j++) {
+      if (arr[j].marks > arr[maxIdx].marks) {
+        maxIdx = j;
+      }
+    }
+    [arr[i], arr[maxIdx]] = [arr[maxIdx], arr[i]]; // swap
+  }
+
+  return arr.slice(0, 3);
+};
+
+console.log(three(res));
+
+
+
+// 3. Flatten [[1,2],[3,4],[5]] into [1,2,3,4,5] without using .flat().
+// Solution:
+const arr = [[1,2],[3,4],[5]];
+let flat = [];
+
+for (let lis of arr) {
+    for (let ele of lis) {
+        flat.push(ele);
+    }
+}
+
+console.log(flat);
+
+
+// ---------- CALLBACKS / PROMISES / ASYNC (4–6) ----------
+
+// 4. Create retry(fn, attempts) that retries a failing promise.
+// Solution:
+
+
+
+// 5. Create a delay(ms) function and print numbers 1 to 5 with pauses.
+// Solution:
+
+
+
+// 6. Run two async tasks but fail fast if either rejects.
+// Solution:
+
+
+
+
+// ---------- TIMERS / LOGIC (7–10) ----------
+
+// 7. Build a clock that prints the current time every second.
+// Solution:
+
+
+
+// 8. Build a function that measures how long another function takes to run.
+// Solution:
+
+
+
+// 9. Create a countdown timer with pause, resume, and reset.
+// Solution:
+
+
+
+// 10. Explain the output order of:
+// Write explanation here:
+
+
+
+
+
+//
+// ======================================================
+//                      MINI PROJECTS
+// ======================================================
+//
+
+// ---------- PROJECT 1: Task Scheduler ----------
+// Build a small task scheduler that:
+// - Accepts tasks
+// - Schedules them using setTimeout
+// - Prints "Task <name> executed"
+// - Allows canceling tasks
+// Solution starter:
+
+
+
+
+
+
+// ---------- PROJECT 2: Mini Quiz App ----------
+// Requirements:
+// - Store questions in an array of objects
+// - 10-second timer per question
+// - Auto-move to next question
+// - Show final score
+// Solution starter:
+
+
+
+
+
+