V2Solutions Front end Developer Interview Questions and Answers

Q1. Closure,html,css,react
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Q2. Implment timer in react
Ans. 
To implement a timer in React, you can use the useState hook to manage the timer state and useEffect hook to update the timer.
• Use useState hook to initialize timer state

• Use useEffect hook to update timer every second

• Display the timer value in the component's render method
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Coding test for react and also asked to show my project

Logical, English Grammar

In simform Interview Aptitude test is just a common test which contains all types of questions it includes reasoning, aptitude, c language pseudocode and verbal ability questions. Questions are easy to moderate not so difficult.

Simform coding test is having 5 coding problems. Which includes simple array and DSA related problems . 3 problems are easy to moderate . 1 or 2 problems they give little bit hard . They ask a big SQL query also as a coding problem in that 5 problems . You have to solve atleast 3 or more problems to comfortably pass coding round .

Q1. In Interview round they will ask Basic questions related to your preferred job domain. In my case I have applied for React js developer they asked me javascript questions and commonly database questions. T...read more
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Q2. 1. What is difference between abstract class and interface ?
Ans. 
Abstract class can have implementation while interface cannot. A class can implement multiple interfaces but only extend one abstract class.
• Abstract class can have constructors while interface cannot.

• Abstract class can have non-abstract methods while interface can only have abstract methods.

• A class can implement multiple interfaces but only extend one abstract class.

• Abstract class can have instance variables while inte...read more
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Q3. 2. What is Arrow Function in Javascripts?
Ans. 
Arrow functions are a concise way to write functions in JavaScript.
• Arrow functions have a shorter syntax compared to regular functions.

• They do not have their own 'this' value, instead, they inherit 'this' from the surrounding context.

• Arrow functions are always anonymous and cannot be used as constructors.

• They are commonly used in React components for event handlers and callback functions.
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Q4. 3. What is Difference between primary key and unique key ?
Ans. 
Primary key uniquely identifies a record in a table, while unique key ensures that all values in a column are distinct.
• Primary key is used to enforce entity integrity, while unique key enforces domain integrity.

• A table can have only one primary key, but multiple unique keys.

• Primary key can't have null values, while unique key can have null values.

• Primary key is automatically indexed, while unique key may or may not be
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Q5. 4. how you join three different tables in SQL ?
Ans. 
To join three different tables in SQL, you can use the JOIN keyword along with the appropriate join conditions.
• Use the JOIN keyword to combine tables based on a common column

• Specify the join conditions using the ON keyword

• You can join more than two tables by chaining multiple JOIN statements

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN
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Q6. 5. Why we require interface and what is interface in java ?
Ans. 
Interfaces in Java provide a way to achieve abstraction and multiple inheritance.
• Interfaces define a set of methods that a class must implement.

• They allow for loose coupling between classes.

• Interfaces can be used to achieve polymorphism.

• Java does not support multiple inheritance, but interfaces provide a way to achieve it.

• Interfaces are used extensively in Java frameworks like Spring and Hibernate.
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Q7. 6. What is Encapsulation in java with example ?
Ans. 
Encapsulation is a mechanism of wrapping data and code acting on the data together as a single unit.
• Encapsulation is used to hide the implementation details of an object from the outside world.

• It helps in achieving data abstraction and data hiding.

• In Java, encapsulation is achieved by declaring the variables of a class as private and providing public getter and setter methods to access and modify the data.

• Example: A ba...read more
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Q8. 7. Is exception handling is required in a big project or we don't have to handle exception?
Ans. 
Yes, exception handling is required in a big project.
• Exception handling helps in identifying and resolving errors during runtime.

• It improves the stability and reliability of the application.

• Exceptions can occur due to various reasons like network issues, server errors, or user input errors.

• Handling exceptions gracefully prevents the application from crashing and provides a better user experience.

• It allows for proper er...read more
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Q9. 8. do you have any master 's plan or further studies in abroad?
Ans. 
Yes, I have plans to pursue a master's degree in abroad.
• I have always been passionate about learning and expanding my knowledge in the field of frontend development.

• Pursuing a master's degree in a foreign country will provide me with a global perspective and exposure to diverse cultures.

• I believe that studying abroad will enhance my skills and make me a more well-rounded developer.

• I have researched various universities...read more
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Q10. 9. What is difference between overloading and overriding?
Ans. 
Overloading is having multiple methods with the same name but different parameters. Overriding is implementing a method in a subclass that already exists in the parent class.
• Overloading is compile-time polymorphism while overriding is runtime polymorphism.

• Overloading is used to provide different ways of calling the same method with different parameters.

• Overriding is used to provide a specific implementation of a method...read more
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Q11. 10. Which are the access specifiers in java ?
Ans. 
Access specifiers in Java are keywords that determine the visibility of a class, method, or variable.
• There are four access specifiers in Java: public, private, protected, and default.

• Public: accessible from anywhere in the program.

• Private: accessible only within the same class.

• Protected: accessible within the same class, subclasses, and same package.

• Default: accessible within the same package only.
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