Mactosys Software Solution Reactjs Developer Interview Questions and Answers

Q1. What are states in react?
Ans. 
States in React are mutable data that control the behavior of a component and determine what is rendered on the screen.
• States are used to store and manage data within a component.

• They are mutable and can be updated using the setState() method.

• Changes in state trigger re-rendering of the component.

• States are initialized in the constructor of a class component or using the useState hook in functional components.
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Q2. What are events
Ans. 
Events in React are actions that occur as a result of user interaction or system events.
• Events are used to trigger functions or actions in response to user input.

• Examples of events include onClick, onChange, onSubmit, etc.

• Event handlers are functions that are executed when an event is triggered.
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Q3. Write code to print pyramid pattern
Ans. 
Print pyramid pattern using nested loops
• Use nested loops to print each row of the pyramid

• Increment spaces and decrement stars in each row

• Example: for a pyramid with 5 rows -

• *

• ***

• *****

• *******

• *********
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Q1. Basic about react like what is state, props etc
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It was a machine test. I was given to build a login form and registration form and also to validate those using apis