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Common Nodejs Interview questions:๐ŸŽฏ

What is Node.js?

How does Node.js handle asynchronous operations?

Explain the role of npm.

Differentiate between let, var, and const in JavaScript.

What is the purpose of the package.json file?

How do you handle errors in Node.js?

What is the purpose of the exports object in Node.js modules?

What is middleware in the context of Express.js?

How does Node.js handle child processes?

Explain the concept of the Event Loop in Node.js.

How does routing work in Express.js?

What is the purpose of the body-parser middleware in Express.js?

Explain the role of the dirname and filename variables in Node.js.

What is callback hell? How can it be avoided?

What are Promises in Node.js? How do they differ from callbacks?

Describe the role of the process object in Node.js.

What is the purpose of the module.exports object?

How can you handle file uploads in Node.js?

Explain the difference between process.nextTick() and setImmediate() in Node.js.

How does clustering work in Node.js?
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Master JavaScript.

Follow these Github Repos:

1. ๐Ÿ“š You-Dont-Know-JS
2. ๐Ÿ˜ต wtfjs
3. ๐Ÿงฉ javascript-algorithms
4. โœจ clean-code-javascript
5. ๐Ÿค” javascript-questions
6. ๐Ÿ†• ES6-for-humans
7. ๐Ÿ JavaScript30
8. ๐Ÿ“ฆ js-stack-from-scratch
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6 API Architectural designs You Must Know

1. REST ๐ŸŒ
Representational State Transfer - REST is like a classic library where you request specific books and receive them as they are. It's simple and widely used for web APIs, like ordering a la carte from a menu ๐Ÿฝ๏ธ.

2. GraphQL ๐Ÿš€
GraphQL is like a customizable buffet ๐Ÿด where you ask for exactly what you want and get a tailored plate. It allows clients to request only the data they need, reducing over-fetching.

3. SOAP ๐Ÿงผ
SOAP (Simple Object Access Protocol) is like sending a letter ๐Ÿ’Œ with detailed instructions, complete with a table of contents. It's more structured but can be heavier than REST or GraphQL.

4. gRPC ๐Ÿš„:
gRPC is like a high-speed train ๐Ÿš„ for communication between services. It uses Protocol Buffers for efficient data exchange and supports streaming and bidirectional communication.

5. WebSockets ๐ŸŒ๐Ÿ’ฌ
WebSockets are like real-time phone calls โ˜Ž๏ธ for the web. They enable two-way communication, perfect for chat apps and live updates.

6. MQTT ๐Ÿ“ก
MQTT (Message Queuing Telemetry Transport) is like a radio broadcast ๐Ÿ“ป, designed for low-bandwidth, high-latency, or unreliable networks. Ideal for IoT devices and sensor data.
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Excel Shortcuts

1. Ctrl + N: To create a new workbook.
2. Ctrl + O: To open a saved workbook.
3. Ctrl + S: To save a workbook.
4. Ctrl + A: To select all the contents in a workbook.
5. Ctrl + B: To turn highlighted cells bold.
6. Ctrl + C: To copy cells that are highlighted.
7. Ctrl + D: To fill the selected cell with the content of the cell right above.
8. Ctrl + F: To search for anything in a workbook.
9. Ctrl + G: To jump to a certain area with a single command.
10. Ctrl + H: To find and replace cell contents.
11. Ctrl + I: To italicise cell contents.
12. Ctrl + K: To insert a hyperlink in a cell.
13. Ctrl + L: To open the create table dialog box.
14. Ctrl + P: To print a workbook.
15. Ctrl + R: To fill the selected cell with the content of the cell on the left.
16. Ctrl + U: To underline highlighted cells.
17. Ctrl + V: To paste anything that was copied.
18. Ctrl + W: To close your current workbook.
19. Ctrl + Z: To undo the last action.
20. Ctrl + 1: To format the cell contents.
21. Ctrl + 5: To put a strikethrough in a cell.
22. Ctrl + 8: To show the outline symbols.
23. Ctrl + 9: To hide a row.
24. Ctrl + 0: To hide a column.
25. Ctrl + Shift + :: To enter the current time in a cell.
26. Ctrl + ;: To enter the current date in a cell.
27. Ctrl + `: To change the view from displaying cell values to formulas.
28. Ctrl + โ€˜: To copy the formula from the cell above.
29. Ctrl + -: To delete columns or rows.
30. Ctrl + Shift + =: To insert columns and rows.
31. Ctrl + Shift + ~: To switch between displaying Excel formulas or their values in cell.
32. Ctrl + Shift + @: To apply time formatting.
33. Ctrl + Shift + !: To apply comma formatting.
34. Ctrl + Shift + $: To apply currency formatting.
35. Ctrl + Shift + #: To apply date formatting.
36. Ctrl + Shift + %: To apply percentage formatting.
37. Ctrl + Shift + &: To place borders around the selected cells.
38. Ctrl + Shift + _: To remove a border.
39. Ctrl + -: To delete a selected row or column.
40. Ctrl + Spacebar: To select an entire column.
41. Ctrl + Shift + Spacebar: To select an entire workbook.
42. Ctrl + Home: To redirect to cell A1.
43. Ctrl + Shift + Tab: To switch to the previous workbook.
44. Ctrl + Shift + F: To open the fonts menu under format cells.
45. Ctrl + Shift + O: To select the cells containing comments.
46. Ctrl + Drag: To drag and copy a cell or to a duplicate worksheet.
47. Ctrl + Shift + Drag: To drag and insert copy.
48. Ctrl + Up arrow: To go to the top most cell in a current column.
49. Ctrl + Down arrow: To jump to the last cell in a current column.
50. Ctrl + Right arrow: To go to the last cell in a selected row.
51. Ctrl + Left arrow: To jump back to the first cell in a selected row.
52. Ctrl + End: To go to the last cell in a workbook.
53. Alt + Page down: To move the screen towards the right.
54. Alt + Page Up: To move the screen towards the left.
55. Ctrl + F2: To open the print preview window.
56. Ctrl + F1: To expand or collapse the ribbon.
57. Alt: To open the access keys.
58. Tab: Move to the next cell.
59. Alt + F + T: To open the options.
60. Alt + Down arrow: To activate filters for cells.
61. F2: To edit a cell.
62. F3: To paste a cell name if the cells have been named.
63. Shift + F2: To add or edit a cell comment.
64. Alt + H + H: To select a fill colour.
65. Alt + H + B: To add a border.
66. Ctrl + 9: To hide the selected rows.
67. Ctrl + 0: To hide the selected columns.
68. Esc: To cancel an entry.
69. Enter: To complete the entry in a cell and move to the next one.
70. Shift + Right arrow: To extend the cell selection to the right.
71. Shift + Left arrow: To extend the cell selection to the left.
72. Shift + Space: To select the entire row.
73. Page up/ down: To move the screen up or down.
74. Alt + H: To go to the Home tab in Ribbon.
75. Alt + N: To go to the Insert tab in Ribbon.
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76. Alt + P: To go to the Page Layout tab in Ribbon.
77. Alt + M: To go to the Formulas tab in Ribbon.
78. Alt + A: To go to the Data tab in Ribbon.
79. Alt + R: To go to the Review tab in Ribbon.
80. Alt + W: To go to the View tab in Ribbon.
81. Alt + Y: To open the Help tab in Ribbon.
82. Alt + Q: To quickly jump to search.
83. Alt + Enter: To start a new line in a current cell.
84. Shift + F3: To open the Insert function dialog box.
85. F9: To calculate workbooks.
86. Shift + F9: To calculate an active workbook.
87. Ctrl + Alt + F9: To force calculate all workbooks.
88. Ctrl + F3: To open the name manager.
89. Ctrl + Shift + F3: To create names from values in rows and columns.
90. Ctrl + Alt + +: To zoom in inside a workbook.
91. Ctrl + Alt +: To zoom out inside a workbook.
92. Alt + 1: To turn on Autosave.
93. Alt + 2: To save a workbook.
94. Alt + F + E: To export your workbook.
95. Alt + F + Z: To share your workbook.
96. Alt + F + C: To close and save your workbook.
97. Alt or F11: To turn key tips on or off.
98. Alt + Y + W: To know what's new in Microsoft Excel.
99. F1: To open Microsoft Excel help.
100. Ctrl + F4: To close Microsoft Excel.
1. Screenr.com: This website helps you Record movies on your computer and send them straight to YouTube.

2. Bounceapp.com: For capturing full length screenshots of a web pages.

3. Goo.gl: Shorten long URLs and convert URLs into QR codes.

4. untiny.me: Find the original URLs that's hiding behind a short URLs.

5. localti.me: Know more than just the local time of a city

6. copypastecharacter.com: Copy-paste special characters that are not on your keyboard.

7. topsy.com: A better search engine for twitter.

8. fb.me/AppStore: Search iOS apps without launching iTunes.

9. iconfinder.com: The best place to find icons of all sizes.

10. office.com: Download templates, clipart and images for your Office documents.

11. woorank.com: everything you wanted to know about a website.

12. virustotal.com: Scan any suspicious file or email attachment for viruses.

13. wolframalpha.com: Gets answers directly without searching .

14. printwhatyoulike.com: Print web pages without the clutter.

15. joliprint.com: Reformats news articles and blog content as a newspaper.

16. isnsfw.com: When you wish to share a NSFW page but with a warning.

17. eggtimer.com: A simple online timer for your daily needs.

18. coralcdn.org: If a site is down due to heavy traffic, try accessing it through coral CDN.

19. random.org: Pick random numbers, flip coins, and more.

20. mywot.com: Check the trust level of any website .

21. viewer.zoho.com: Preview PDFs and Presentations directly in the browser.

22. tubemogul.com: Simultaneously upload videos to YouTube and other video sites.

23. truveo.com: The best place for searching web videos.

24. scr.im: Share your email address online without worrying about spam.

25. spypig.com: Now get read receipts for your email.

26. sizeasy.com: Visualize and compare the size of any product.

27. whatfontis.com: quickly determine the font name from an image.

28. fontsquirrel.com: A good collection of fonts free for personal and commercial use.

29. regex.info: Find data hidden in your photographs .

30. tineye.com: This is like an online version of Google Googles.

31. iwantmyname.com: Helps you search domains across allTLDs.

32. tabbloid.com: Your favorite blogs delivered as PDFs.

33. join.me: Share your screen with anyone over the web.

34. onlineocr.net: Recognize text from scanned PDFs and images โ€œ see other OCR tools.

35. flightstats.com: Track flight status at airports worldwide.

36. wetransfer.com: For sharing really big files online.

37. pastebin.com: A temporary online clipboard for your text and code snippets.

38. polishmywriting.com: Check your writing for spelling or grammatical errors.

39. awesomehighlighter.com: Easily highlight the important parts of a web page.

40. typewith.me: Work on the same document with multiple people.

41. whichdateworks.com: Planning an event? Find a date that works for all.

42. everytimezone.com: A less confusing view of the world time zones.

43. warrick.cs.odu.edu: You'll need this when your bookmarked web pages are deleted.

44. gtmetrix.com: The perfect tool for measuring your site performance online.

45. imo.im: Chat with your buddies on Skype,Facebook, GoogleTalk, etc from one place.

46. translate.google.com: Translate web pages,PDFs and Office documents.

47. youtube.com/leanback: Sit back and enjoy YouTube videos in full-screen mode.

48. similarsites.com: Discover new sites that are similar to what you like already.

49. wordle.net: Quick summarize long pieces of text with tag clouds.

50. bubbl.us: Create mind-maps, brainstorm ideas in the browser.

51. kuler.adobe.com: Get color ideas, also extract colors from photographs.

52. followupthen.com: Setup quick reminders via email itself.

53. lmgtfy.com: When your friends are too lazy to use Google on their own.

54. tempalias.com: Generate temporary emailaliases, better than disposable email.
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Both aren't same. Here is the difference between, Nextjs and Reactjs

React:
- JS library for building user interfaces.
- Focuses on the client-side (browser).
- No built-in server-side rendering/routing.

Next.js:
- React framework for web applications.
- Supports server-side rendering and static site generation.
- Built-in routing system.