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Knowing React won't make you a great web developer.

Knowing Javascript fundamentals will.

7 concepts simplified with visuals:


𝟬. 𝗧𝗵𝗲 𝗘𝘃𝗲𝗻𝘁 𝗟𝗼𝗼𝗽:💡

The event loop is a mechanism that allows JavaScript to perform non-blocking operations, with smooth functionality and UX by handling asynchronous callbacks.

➡️ It's important as it enables efficient execution of tasks in a single-threaded env.


𝟭. 𝗛𝗼𝗶𝘀𝘁𝗶𝗻𝗴:💡

Hoisting is JavaScript's default behavior of moving declarations to the top of their scope before code execution.

➡️ Understanding it will help you avoid reference errors and write predictable code.


𝟮. 𝗦𝗰𝗼𝗽𝗲 (𝗖𝗵𝗮𝗶𝗻):💡

The scope in JavaScript defines where variables and functions are accessible.

➡️ The scope chain ensures that code in one scope can access variables from higher scopes but not vice versa, which is important for managing naming collisions.


𝟯. 𝗧𝗵𝗲 𝗝𝗮𝘃𝗮𝘀𝗰𝗿𝗶𝗽𝘁 𝗘𝗻𝗴𝗶𝗻𝗲:💡

The JavaScript engine is the interpreter that converts your JavaScript code into machine code.

➡️ Its efficiency directly impacts the performance of your application: understanding how it works = knowing how to optimize your code.


𝟰. 𝗣𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗮𝗹 𝗜𝗻𝗵𝗲𝗿𝗶𝘁𝗮𝗻𝗰𝗲:💡

Prototypal Inheritance is a feature in JavaScript where objects inherit properties from other objects.

➡️ It's fundamental for creating complex object hierarchies and sharing functionality, allowing to reuse code more easily.


𝟱. 𝗚𝗲𝗻𝗲𝗿𝗮𝘁𝗼𝗿𝘀 𝗮𝗻𝗱 𝗜𝘁𝗲𝗿𝗮𝘁𝗼𝗿𝘀:💡

Generators and iterators are features that allow you to define custom iteration behavior.

➡️ They are important for handling sequential operations, enabling you to work with potentially infinite data streams efficiently.


𝟲. 𝗣𝗿𝗼𝗺𝗶𝘀𝗲𝘀 & 𝗔𝘀𝘆𝗻𝗰/𝗔𝘄𝗮𝗶𝘁:💡

Promises and async/await are constructs that simplify working with asynchronous operations.

➡️ They are used for writing clean, readable code when dealing with callbacks, such as in-network requests or file operations.

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DB Interview questions

Position - Associate Developer
Package - 26LPA

1st Round 🔥
1. What are the new features introduced in Java 8.
https://www.baeldung.com/java-8-new-features

2. Sort a student class list based on the student age in descending order.
https://www.educative.io/answers/how-to-sort-a-list-of-user-defined-objects-in-java

3. Write a logic to detect a loop in linked list and remove the loop
https://www.google.com/amp/s/www.geeksforgeeks.org/detect-loop-in-a-linked-list/amp/

4. Design HashMap put method.
https://www.turing.com/kb/implementing-hashmap-in-java

5. How to divide a monolithic application to Microservice
https://martinfowler.com/articles/break-monolith-into-microservices.html

6. Why String is immutable
https://www.google.com/amp/s/www.geeksforgeeks.org/java-string-is-immutable-what-exactly-is-the-meaning/amp/

7. How Redis Works and what are the different caching strategies.
https://codedamn.com/news/backend/advanced-redis-caching-techniques

8. How to add a list in redis cache and how to access the data again
https://redis.io/glossary/lists-in-redis/

9. What are the design pattern spring boots internally use
https://www.baeldung.com/spring-framework-design-patterns

10. How spring Auto configuration features works
https://www.marcobehler.com/guides/spring-boot-autoconfiguration

11. How to enable hibernate caching
https://www.baeldung.com/hibernate-second-level-cache

12. Lazy loading vs Eager Loading
https://www.imperva.com/learn/performance/lazy-loading/

13. Asked me to improve one SQL query
https://developernation.net/blog/12-ways-to-optimize-sql-queries-in-database-management/



2nd Round 🔥
1. Implements a search engine, something like Google. Low Level Coding
https://medium.com/@maxi.gkd/building-a-search-engine-using-a-trie-data-structure-cb79475d8a3d

2. How Pulisher Subscribe modal works
https://www.geeksforgeeks.org/what-is-pub-sub/

3. How to restrict an API call to be called from users who have required roles and permission
https://www.baeldung.com/role-and-privilege-for-spring-security-registration

4. Request Scope in spring boot
https://www.baeldung.com/spring-bean-scopes#:~:text=The%20request%20scope%20creates%20a,for%20a%20particular%20WebSocket%20session.
5. How to exclude a dependency
https://www.baeldung.com/mvn-plugin-dependency-exclusion

6. How to pass JWT token in rest api call
https://www.toptal.com/spring/spring-security-tutorial

7. logic to execute a method after every one hour without using Cron job
https://stackoverflow.com/questions/10748212/how-to-call-function-every-hour-also-how-can-i-loop-this#:~:text=Create%20a%20Timer%20object%20and,timer.

while(1==1) {
//Your code here
try{
Thread.sleep(3600000);
}
catch (Exception e) {}
}

8. Difference between scheduled and cached thread pool
https://www.linkedin.com/pulse/types-thread-pool-executors-aniket-nandan?utm_source=share&utm_medium=member_android&utm_campaign=share_via
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