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✅ *Top 50 Tableau Interview Questions*

1. What is Tableau?
2. What are different Tableau products?
3. Difference between Tableau Desktop and Tableau Public
4. What are Dimensions and Measures?
5. What is a Tableau Dashboard?
6. What is a Story in Tableau?
7. What are different types of joins in Tableau?
8. What is blending vs joining in Tableau?
9. Explain live vs extract connection
10. What is a calculated field?
11. Difference between discrete and continuous fields
12. What is LOD (Level of Detail) expression?
13. Types of LODs: FIXED, INCLUDE, EXCLUDE
14. What is the use of parameters in Tableau?
15. Difference between filter, quick filter, and context filter
16. What are sets and groups in Tableau?
17. What is a hierarchy in Tableau?
18. Explain dual-axis and combined axis
19. What is the Show Me panel in Tableau?
20. How do you optimize dashboard performance?
21. What is data densification in Tableau?
22. What is data interpreter?
23. How to remove NULLs from a visualization?
24. What is Tableau Prep?
25. Explain Tableau Server and its role
26. What is the use of published data sources?
27. How to schedule extracts in Tableau?
28. Difference between TDS and TDSX files
29. What are bullet charts and when to use them?
30. What is a Gantt chart in Tableau?
31. How do you implement row-level security?
32. What is a treemap and when is it useful?
33. Explain story points in Tableau
34. What are bins? How do you create them?
35. What is data blending? When is it used?
36. What is the Tableau order of operations?
37. How do you show top N records dynamically?
38. What are tooltips and how can you customize them?
39. What is cascading filter?
40. How do you publish a workbook to Tableau Server?
41. What is a context filter and why use it?
42. Explain how Tableau handles large datasets
43. How to create custom geocoding?
44. What is a reference line?
45. Explain trend lines and forecasting
46. What is Tableau’s default date hierarchy?
47. What is the difference between extract and live connection?
48. What is data pivoting in Tableau?
49. How do you embed Tableau dashboards into websites?
50. How do you debug a Tableau calculation?

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✅ Top 50 JavaScript Interview Questions 💻✨

1. What are the key features of JavaScript? 
2. Difference between var, let, and const 
3. What is hoisting? 
4. Explain closures with an example 
5. What is the difference between == and ===? 
6. What is event bubbling and capturing? 
7. What is the DOM? 
8. Difference between null and undefined 
9. What are arrow functions? 
10. Explain callback functions 
11. What is a promise in JS? 
12. Explain async/await 
13. What is the difference between call, apply, and bind? 
14. What is a prototype? 
15. What is prototypal inheritance? 
16. What is the use of ‘this’ keyword in JS? 
17. Explain the concept of scope in JS 
18. What is lexical scope? 
19. What are higher-order functions? 
20. What is a pure function? 
21. What is the event loop in JS? 
22. Explain microtask vs. macrotask queue 
23. What is JSON and how is it used? 
24. What are IIFEs (Immediately Invoked Function Expressions)? 
25. What is the difference between synchronous and asynchronous code? 
26. How does JavaScript handle memory management? 
27. What is a JavaScript engine? 
28. Difference between deep copy and shallow copy in JS 
29. What is destructuring in ES6? 
30. What is a spread operator? 
31. What is a rest parameter?
32. What are template literals? 
33. What is a module in JS? 
34. Difference between default export and named export 
35. How do you handle errors in JavaScript? 
36. What is the use of try...catch? 
37. What is a service worker? 
38. What is localStorage vs. sessionStorage? 
39. What is debounce and throttle? 
40. Explain the fetch API 
41. What are async generators? 
42. How to create and dispatch custom events? 
43. What is CORS in JS? 
44. What is memory leak and how to prevent it in JS? 
45. How do arrow functions differ from regular functions? 
46. What are Map and Set in JavaScript? 
47. Explain WeakMap and WeakSet 
48. What are symbols in JS? 
49. What is functional programming in JS? 
50. How do you debug JavaScript code?

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