Perfex Technologies React Js Frontend Developer Interview Questions and Answers

It was a aptitude test with unit test cases where you have to create election poll application in react

3 Angular coding question was there. 1.5 hour Machine test.

Q1. Pass by Value, pass by reference
Add your answer
Q2. What is !! Operator
Ans. 
The !! operator is used to convert a value to a boolean type by negating it twice.
• The !! operator is used to convert a value to a boolean type.

• It first negates the value, then negates it again to return a boolean.

• Example: !!'hello' will return true, as a non-empty string is truthy.
Answered by AI
Add your answer
Q3. How to handle multiple API if they are inter related each other in Angular?
Ans. 
Use Angular services to manage multiple APIs, create separate services for each API, and handle interdependencies using observables and RxJS operators.
• Create separate Angular services for each API to encapsulate API calls and logic.

• Use observables and RxJS operators to handle asynchronous data flow and manage interdependencies between APIs.

• Implement error handling and retry mechanisms to ensure robustness when dealing ...read more
Answered by AI
Add your answer

60 min coding round based on angular

Q1. State mangement
Add your answer