MEAN_interview_questions_Exp_2-3years.txt

### MEAN Interview Questions for 2-3 years Experience

## Node and javascript
1. async,await and promise difference
2. callback hell how to remove this callback hell
3. error first callback
4. Nodejs and Angular difference 
5. closure
6. spread operator, rest operator
7. hoisting
8. arrow function and normal function difference
9. middleware in nodejs
10. call, bind, apply with example
11. promise chaining
12. promise.all
13. libuv in nodejs,
14. architecture of nodejs
15. event loop in nodejs
16. destructuring in javascript
17. ES6 features with examples
18. var let const difference
19. null undefined undeclared
20. module.exports and exports
21. diff between typescript and javascript
22. type of Array function.
23. diff between map,filter,forEach
24. cluster,fork, process spawn in nodejs
25. Argument in javascript
26. prototyping  (very important)
27. method of object creation, object cloning
28. Authorization and Authentication
29. Difference between slice and splice ( Important )
30. Error Handling in Nodejs
31. What are packages have you used in Nodejs?
32. Difference between package.json and package-lock.json


## Angular
1. component, Directives, Pipe
2. dependency injection
3. routing, wild card routes
4. lifecycle hooks
5. communication between two component if its child parent or independent component
6. rxjs, types of rxjs
7. what is an interceptor and why we use Interceptor. 
8. guards ->(CanActivate, CanActivateChild, CanDeactivate,Resolve and CanLoad)
9. knowledge of creating custom directive, pipe, module
10. Observalables and Promise differences with example
11. Difference between Angular 4 and Angular 8 
12. What are Decorators in Angular?
13. Difference between Angularjs and Angular 2  {( Important )
14. DataBindings in Angular 
15. Subjects vs BehaviorSubjects
16. Lazy loading in Angular
17. Difference between Local Storage, Session Storage and Cookies
18. Starting point of Angular?


## MongoDB
1.Difference between Relational DB and Non-Relational DB
2. What is Aggregation and its pipeline stages?
3. Can we achieve joins in Mongo? Yes, vai $lookup pipeline
4. Sharding 
5. Replication