Invenio Business Solutions Full Stack Software Developer Interview Questions and Answers

Q1. Basic questions about javascript
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Q2. Basic questions about nodejs
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Q1. What is dependency injection
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Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing and swapping of dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.
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Q2. What is solid principles
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SOLID principles are a set of five design principles that help developers create more maintainable and scalable software.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses with...read more
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It will good and easy for me to attend it

Questions in collection,java 8 concepts.

Q1. What is closures in JS ?
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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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Q1. What is concurrent hashmap
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ConcurrentHashMap is a thread-safe implementation of the HashMap class in Java.
• ConcurrentHashMap allows multiple threads to read and write to the map concurrently without causing any data corruption.

• It achieves thread-safety by dividing the map into segments, each of which can be locked independently.

• ConcurrentHashMap is more efficient than using synchronized collections for concurrent access.

• Example: ConcurrentHashMap
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Q2. How is dependency injection different from dependency inversion
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Dependency injection is a design pattern where dependencies are provided to a class from the outside, while dependency inversion is a principle that states high-level modules should not depend on low-level modules, but both should depend on abstractions.
• Dependency injection is a technique to achieve dependency inversion.

• Dependency injection involves providing dependencies to a class from the outside, typically through ...read more
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Q3. If I add 2 same attribute values for a object to a set...will I see 2 objects in the set, if yes what changes you make to the code to insert unique objects to a set
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No, you will not see 2 objects in the set. To insert unique objects to a set, you can override the equals() and hashCode() methods in the object class.
• In a set, each element must be unique based on the equals() method. If you add 2 objects with the same attribute values, only one will be stored in the set.

• To ensure uniqueness, override the equals() and hashCode() methods in the object class. This will define how object...read more
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Q4. What is serialisation, externalisation, serializable
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Serialisation is the process of converting an object into a format that can be easily stored or transmitted. Externalisation is a way to customize the serialization process. Serializable is an interface in Java that allows objects to be serialized.
• Serialisation is the process of converting an object into a format that can be easily stored or transmitted

• Externalisation is a way to customize the serialization process

• Seri...read more
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Q5. Write a Generic method to add string or integer to List or List
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Create a generic method to add string or integer to List or List
• Create a generic method that takes a List and an element as input

• Use Java generics to specify the type of List and element

• Check the type of List and element, then add the element to the List
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Oops concept, basic javascript and react js coding question

Q1. React js and asp.net basic interview questions
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General aptitude, computer science fundamentals multiple-choice questions, and data structures and algorithms multiple-choice questions were asked.

Q1. Given a string, write a function to reverse the string.
Ans. 
Function to reverse a given string
• Create an empty string to store the reversed string

• Iterate through the input string in reverse order and append each character to the new string

• Return the reversed string
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Q2. Given a sorted array of integers, write a function to perform a binary search to find the index of a target value. If the target value is not found, return -1.
Ans. 
Binary search function to find target value in sorted array
• Define function that takes sorted array and target value as input

• Initialize variables for start, end, and middle indices

• Use while loop to iterate until start is less than or equal to end
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Q1. About the company
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Q2. What are three significant achievements in your life?
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Graduating with honors, winning a hackathon, volunteering in a developing country
• Graduated with honors from university with a degree in Computer Science

• Won first place in a hackathon competition by developing a unique and innovative software solution

• Volunteered in a developing country to help build schools and provide education to underprivileged children
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