Infosys Spark Developer Interview Questions and Answers

Q1. React Life cycle
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Q2. What React hooks have you utilized in your projects?
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Q3. What is Redux, and what are the differences between Redux and Context?
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Q4. What is the difference between visibility: hidden and display: none in CSS?
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Q5. What are JavaScript closures, the temporal dead zone (TDZ), hoisting, and the JavaScript engine?
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Identify the duplicate character in the string.

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?
Ans. 
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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Q1. Project related question , Interface , Abstraction
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Q1. Scenario based question
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Q1. Salary Discussioon
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Q1. Angular routing
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Q2. What are pipes in angular
Ans. 
Pipes in Angular are used for transforming data in templates.
• Pipes are used to format data before displaying it in the view

• They can be used to filter, sort, or transform data in various ways

• Examples include date pipe, currency pipe, and uppercase/lowercase pipe
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Q1. Which version of java you use?
Ans. 
I use Java version 8 for Angular development.
• I use Java 8 for its compatibility with Angular frameworks and libraries.

• Java 8 introduced features like lambda expressions and streams which are useful in Angular development.

• Example: I use Java 8 to write backend services for my Angular applications.
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Q2. What are the new features in java 8?
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces provide a way to define interfaces with a single abstract method.

• Streams allow you to process collections of objects in a functional style.

• Default methods allow you to add new methods to interfaces wit
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Q1. Mostly js questions, not so many of angular or react.
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Q2. Like fizbuzz or things like that.
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Q1. Ui development and component related
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Q2. Performance of technology and challenges
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Q1. Personal introduction and location details
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Q2. Negatition of salries excepectations
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Q1. Sliding Window find the subarray with sum equal to k
Ans. 
Using sliding window technique to find subarray with sum equal to k.
• Initialize two pointers at the start of the array.

• Move the right pointer to expand the window until the sum is greater than or equal to k.

• Move the left pointer to shrink the window if the sum exceeds k.

• Repeat until the end of the array is reached.

• Example: Input array [1, 4, 20, 3, 10, 5], k=33. Output: [20, 3, 10].
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Q1. Tell me about your experience.
Ans. 
I have 5 years of experience in developing web applications using Angular.
• Developed responsive web applications using Angular framework

• Implemented RESTful APIs to fetch and update data

• Worked on optimizing performance and improving user experience

• Collaborated with UI/UX designers to create visually appealing interfaces
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Q2. What is directive
Ans. 
A directive in Angular is a class with a @Directive decorator that allows you to attach behavior to elements in the DOM.
• Directives are used to manipulate the DOM, add behavior to elements, and create reusable components.

• There are three types of directives in Angular: Component, Structural, and Attribute directives.

• Examples of directives include ngIf, ngFor, and ngStyle.
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