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📌

transactions(transaction_id, user_id, transaction_date, amount)

❓ Ques :

👉 Find users who made multiple transactions with the same amount consecutively.

🧩 How Interviewers Expect You to Think

• Sort transactions chronologically for each user
• Compare the current transaction amount with the previous one
• Use a window function to detect consecutive duplicates

💡 SQL Solution

SELECT
user_id,
transaction_date,
amount
FROM (
SELECT
user_id,
transaction_date,
amount,
LAG(amount) OVER (
PARTITION BY user_id
ORDER BY transaction_date
) AS prev_amount
FROM transactions
) t
WHERE amount = prev_amount;

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1️⃣ Core Programming Fundamentals
• Variables, data types, operators
• Control flow (loops, conditions)
• Functions recursion
• Time space complexity basics
• Debugging mindset

2️⃣ Data Structures (High Priority)
• Arrays Strings
• Linked Lists
• Stacks Queues
• HashMaps / Dictionaries
• Trees Binary Trees
• Heaps Priority Queues
• Graphs (BFS, DFS)

3️⃣ Algorithms You MUST Know
• Searching (Binary Search)
• Sorting (Quick, Merge, Heap)
• Recursion Backtracking
• Greedy algorithms
• Dynamic Programming
• Sliding Window
• Two Pointers
• Prefix Sum

4️⃣ Problem-Solving Patterns
• Brute force → optimized approach
• Hashing for lookups
• Divide and conquer
• Recursion → DP conversion
• Space–time tradeoffs

5️⃣ Language-Specific Prep
• Python / Java / C++ fundamentals
• Built-in data structures
• Edge cases constraints
• Writing clean, readable code
• Input/output handling

6️⃣ Coding Interview Expectations
• Explain approach before coding
• Write code step-by-step
• Handle edge cases
• Analyze time space complexity
• Optimize if asked

7️⃣ Common Interview Questions
• Reverse a string / array
• Find duplicates
• Two Sum / Subarray problems
• Palindrome checks
• Tree traversal
• LRU Cache
• Longest substring problems

8️⃣ Where to Practice
• LeetCode (Top priority)
• HackerRank
• Codeforces
• CodeChef
• GeeksforGeeks

9️⃣ Mock Interview Focus
• Think out loud
• Don’t panic on hard questions
• Ask clarifying questions
• Partial solutions still matter
• Correct approach > perfect code

🔟 Pro Tips
✔️ Master patterns, not random problems
✔️ Revise mistakes weekly
✔️ Practice writing code without IDE help
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✅ Advanced JavaScript Interview Questions with Answers 💼🧠

1. What is a closure in JavaScript? 
A closure is a function that retains access to its outer function's variables even after the outer function returns, creating a private scope.

function outer() {
  let count = 0;
  return function inner() {
    count++;
    console.log(count);
  }
}
const counter = outer();
counter(); // 1
counter(); // 2

This is useful for data privacy but watch for memory leaks with large closures.

2. Explain event delegation. 
Event delegation attaches one listener to a parent element to handle events from child elements via event.target, improving performance by avoiding multiple listeners. 
Example:

document.querySelector('ul').addEventListener('click', (e) => {
  if (e.target.tagName === 'LI') {
    console.log('List item clicked:', e.target.textContent);
  }
});

3. What is the difference between == and ===?
⦁ == checks value equality with type coercion (e.g., '5' == 5 is true).
⦁ === checks value and type strictly (e.g., '5' === 5 is false). 
  Always prefer === to avoid unexpected coercion bugs.

4. What is the "this" keyword? 
this refers to the object executing the current function. In arrow functions, it's lexically bound to the enclosing scope, not dynamic like regular functions. 
Example: Regular: this changes with call context; Arrow: this inherits from parent.

5. What are Promises? 
Promises handle async operations with states: pending, fulfilled (resolved), or rejected. They chain with .then() and .catch().

const p = new Promise((resolve, reject) => {
  resolve("Success");
});
p.then(console.log); // "Success"

In 2025, they're foundational for async code but often paired with async/await.

6. Explain async/await. 
Async/await simplifies Promise-based async code, making it read like synchronous code with try/catch for errors.

async function fetchData() {
  try {
    const res = await fetch('url');
    const data = await res.json();
    return data;
  } catch (error) {
    console.error(error);
  }
}

It's cleaner for complex flows but requires error handling.

7. What is hoisting? 
Hoisting moves variable and function declarations to the top of their scope before execution, but only declarations (not initializations).

console.log(a); // undefined (not ReferenceError)
var a = 5;

let and const are hoisted but in a "temporal dead zone," causing errors if accessed early.

8. What are arrow functions and how do they differ? 
Arrow functions (=>) provide concise syntax and don't bind their own this, arguments, or super—they inherit from the enclosing scope.

const add = (a, b) => a + b; // No {} needed for single expression

Great for callbacks, but avoid in object methods where this matters.

9. What is the event loop? 
The event loop manages JS's single-threaded async nature by processing the call stack, then microtasks (Promises), then macrotasks (setTimeout) from queues. It enables non-blocking I/O. 
Key: Call stack → Microtask queue → Task queue. This keeps UI responsive in 2025's complex web apps.

10. What are IIFEs (Immediately Invoked Function Expressions)? 
IIFEs run immediately upon definition, creating a private scope to avoid globals.

(function() {
  console.log("Runs immediately");
  var privateVar = 'hidden';
})();

Less common now with modules, but useful for one-off initialization.

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Which programming language should I use on interview?

Companies usually let you choose, in which case you should use your most comfortable language. If you know a bunch of languages, prefer one that lets you express more with fewer characters and fewer lines of code, like Python or Ruby. It keeps your whiteboard cleaner.

Try to stick with the same language for the whole interview, but sometimes you might want to switch languages for a question. E.g., processing a file line by line will be far easier in Python than in C++.

Sometimes, though, your interviewer will do this thing where they have a pet question that’s, for example, C-specific. If you list C on your resume, they’ll ask it.

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