NielsenIQ Full Stack Software Developer Interview Questions and Answers

Q1. Consumer producer
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Q2. Garbage collection
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Q3. Features of java 8
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow for more concise code and easier parallel programming.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with sequences of elements and perform operations on them.

• Default methods allow interfaces to have method implementations.

• Optional cl...read more
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Q1. What is abstract class
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Abstract class is a class that cannot be instantiated and is used as a blueprint for other classes to inherit from.
• Cannot be instantiated directly

• Can have abstract methods that must be implemented by subclasses

• Can have non-abstract methods that can be inherited by subclasses

• Used to define common behavior for subclasses
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Q2. What are access modifier
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Access modifiers are keywords in programming languages that define the accessibility of classes, methods, and variables.
• Access modifiers control the visibility and accessibility of classes, methods, and variables in a program.

• Common access modifiers include public, private, protected, and default (package-private).

• Public access modifier allows access from any other class.

• Private access modifier restricts access to only...read more
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Q1. Git version tool
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Q2. Project related question
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Q1. Salary expectation
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Q1. HEXA decimal reg expression
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Q2. What are mime types
Ans. 
Mime types are identifiers used to specify the type of data being sent over the internet.
• Mime types are used in HTTP headers to indicate the type of content being sent, such as text/html for HTML files or image/jpeg for JPEG images.

• They help browsers and servers understand how to handle the content being transmitted.

• Mime types also help in determining how a file should be processed or displayed by the receiving end.

• Com...read more
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Technical related questions

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Q1. Java and Backend
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Q2. MySQL and mongodb
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Q1. What is closures in JS ?
Ans. 
Closures in JavaScript are functions that have access to variables from their outer scope, even after the outer function has finished executing.
• Closures are created when a function is defined inside another function.

• The inner function has access to the outer function's variables, parameters, and even the outer function's return value.

• Closures are useful for creating private variables and data encapsulation.

• They can be ...read more
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Q2. Diff props and state ?
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Props and state are both used in React to manage and pass data, but they have different purposes and behaviors.
• Props are read-only and passed from parent components to child components.

• State is mutable and managed within a component.

• Props are used to pass data from a parent component to a child component.

• State is used to manage and update data within a component.

• Props are passed as attributes to a component in JSX.

• Stat...read more
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Q3. How to optimise the performance ?
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Performance optimization involves identifying and resolving bottlenecks to improve the efficiency of software.
• Identify and analyze performance bottlenecks

• Optimize algorithms and data structures

• Improve database performance through indexing and query optimization

• Use caching techniques to reduce database and network calls

• Minimize network latency by optimizing network requests

• Optimize front-end code by reducing DOM manipul...read more
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Q4. Diff between class based or function based component ?
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Class-based components are ES6 classes that extend React.Component, while function-based components are functions that return JSX.
• Class-based components are more feature-rich and have access to lifecycle methods.

• Function-based components are simpler and easier to read and test.

• Class-based components can have state and use lifecycle methods like componentDidMount and componentDidUpdate.

• Function-based components can use ...read more
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Q5. What is es6 features ?
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ES6 (ECMAScript 2015) introduced several new features to JavaScript, enhancing its functionality and making it more efficient.
• Arrow functions: concise syntax for writing functions

• Let and const: block-scoped variables

• Template literals: easier string interpolation

• Destructuring assignment: extracting values from arrays or objects

• Spread syntax: expanding elements in arrays or objects

• Classes: syntactical sugar for creating ...read more
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Was easy. hashmap array question

Easy apti questions.

Q1. Springboot -all questions relevant to springboot were asked
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Aptitude test basic on java

Q1. Java aptitude questions
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Q2. Web technologies
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