LTIMindtree Mern Full Stack Developer Interview Questions and Answers

Q1. What is differnce between class and functional component
Ans. 
Class components are ES6 classes that extend from React.Component and have a render method, while functional components are simple functions that return JSX.
• Class components are more feature-rich and have access to lifecycle methods like componentDidMount, componentDidUpdate, etc.

• Functional components are simpler and easier to read, especially for simple UI components.

• Functional components can use React Hooks to manage...read more
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Q2. Write a basic function component
Ans. 
A basic function component in React
• Create a function component using the 'function' keyword

• Return JSX elements within the component function

• Example: const MyComponent = () => { return

  Hello World!
  ; }
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Q1. What is virtual DOM?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to identify the minimal number of updates needed.

• This approach reduces the number of DOM ...read more
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Q2. What is foriegn Key SQL?
Ans. 
Foreign key in SQL is a field in a table that is a primary key in another table, establishing a relationship between the two tables.
• A foreign key constraint ensures referential integrity between two related tables.

• It helps maintain consistency and avoid orphan records.

• Example: In a database with tables 'orders' and 'customers', the 'customer_id' in 'orders' table can be a foreign key referencing the 'id' column in 'cus
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Q1. What is props
Ans. 
Props are read-only properties that are passed from a parent component to a child component in React.
• Props allow data to be passed down the component tree.

• Props are immutable and cannot be changed by the child component.

• Props are accessed in the child component using this.props.
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Q2. What is Good feedback you ever got in during you development period.
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Q1. Which one you choose mongo vs mysql and why
Ans. 
I would choose MongoDB for its flexibility and scalability in handling unstructured data.
• MongoDB is a NoSQL database, making it easier to work with unstructured data compared to MySQL which is a relational database.

• MongoDB is highly scalable and can handle large amounts of data and high traffic loads.

• MongoDB is a good choice for applications that require frequent updates and real-time analytics.

• MySQL is a better choice...read more
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Q1. Questions about Spring
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Q1. Deep into spring
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Q1. About SQL and quireis
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Quantitive aptitude, reasoning

Q1. Tell me about yourself
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Q2. What is your weakness and strength?
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Q3. Why should I hire you
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Q1. Programming related questions
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The test contains aptitude ques and one coding ques

Q1. They asked about oops concepts in depth
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Q2. They also asked about dbms concepts
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Q3. And one coding ques the ques the interviewer asked is palindrome number
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For a fresher there will be aptitude interview

Q1. There will be technical questions in the round 2
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Q2. 1.What is jvm jre and jdk 2.what is null and its value 3.what is pass by reference 4.what is regular expression
Ans. 
1. JVM is a virtual machine that executes Java bytecode. JRE is a runtime environment that includes JVM and libraries. JDK is a development kit that includes JRE and tools for developing Java applications. 2. Null is a special value that represents the absence of a value. Its value is typically used to indicate that a variable does not refer to any object. 3. Pass by reference is a method of parameter passing where the...read more
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Q1. Oops concepts, API methods,
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Q1. Basic education questions
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