Gazon Communications Full Stack Developer Interview Questions and Answers

Mcq based on language

Q1. Do you know STL. Find loop in linked list.
Ans. 
STL knowledge and finding loop in linked list
• STL (Standard Template Library) is a C++ library that provides containers, algorithms, and iterators.

• To find a loop in a linked list, we can use Floyd's cycle-finding algorithm.

• In this algorithm, we use two pointers, one moving at a slower pace and the other at a faster pace.

• If there is a loop in the linked list, the faster pointer will eventually catch up to the slower poin...read more
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Q1. How to handle exception?
Ans. 
Handle exceptions by using try-catch blocks to gracefully manage errors in code execution.
• Use try-catch blocks to catch exceptions and handle them appropriately.

• Throw custom exceptions when necessary to provide more specific error information.

• Use finally block to execute code that should always run, regardless of whether an exception is thrown.

• Avoid catching generic exceptions like Exception class, instead catch specif...read more
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Q2. What is inheritance?
Ans. 
Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.
• Allows for code reusability by creating a new class based on an existing class

• Derived class inherits properties and behaviors of the base class

• Supports the 'is-a' relationship, where a derived class is a specialized version of the base class
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Q1. Explain yourself
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Programming easy question to understand your logical thinking.

Q1. What is CSS3 flexbox
Ans. 
CSS3 flexbox is a layout module that provides a more efficient way to align and distribute space among items in a container.
• Flexbox allows for flexible and responsive layouts without using floats or positioning.

• It uses a parent container and child elements with flexible properties to create the layout.

• Properties include justify-content, align-items, and flex-wrap.

• Flexbox is supported by all modern browsers.

• Example: read more
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Q2. What is position property in CSS3
Ans. 
Position property in CSS3 is used to set the position of an element relative to its parent or the viewport.
• The position property can take values like static, relative, absolute, fixed, and sticky.

• Static is the default value and elements are positioned according to the normal flow of the document.

• Relative positions the element relative to its normal position.

• Absolute positions the element relative to its nearest positio...read more
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Q3. What is Closure in JS
Ans. 
Closure is a function that has access to its parent scope even after the parent function has returned.
• Closure allows for private variables and functions in JavaScript.

• It is created when a function returns another function.

• The inner function has access to the outer function's variables and parameters.

• Example: function outer() { let x = 10; return function inner() { console.log(x); } }

• Example: const innerFunc = outer(); ...read more
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Q4. What is Prototype in JS
Ans. 
Prototype is a property of an object that allows adding new properties and methods to an object.
• Prototype is a blueprint for creating objects

• It allows inheritance by sharing properties and methods between objects

• Modifying the prototype affects all objects created from it

• Prototype chain allows accessing properties and methods of parent objects

• Example: Array.prototype includes() method
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Q5. What is Pipe in Angular
Ans. 
Pipe is a feature in Angular that allows transforming data before displaying it in the view.
• Pipes are used to format and manipulate data in Angular templates.

• They can be used to filter, sort, and transform data.

• Pipes can be chained together to perform multiple transformations.

• Angular provides built-in pipes like DatePipe, CurrencyPipe, and LowerCasePipe.

• Custom pipes can also be created to meet specific requirements.
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Q6. What is directive in angular
Ans. 
A directive is a component that adds behavior to an existing element or component in Angular.
• Directives are used to manipulate the DOM, add event listeners, and create reusable components.

• There are three types of directives in Angular: component, attribute, and structural.

• Examples of built-in directives in Angular include ngIf, ngFor, and ngStyle.

• Custom directives can be created using the @Directive decorator.
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Q7. What is component in angular
Ans. 
A component in Angular is a reusable piece of UI that consists of HTML, CSS, and TypeScript code.
• Components are the building blocks of Angular applications.

• Each component has its own logic and view.

• Components can be nested within other components.

• Components can communicate with each other using @Input and @Output decorators.

• Examples of components include a login form, a navigation menu, and a product list.
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Q8. What is rxjs observables in nagular
Ans. 
Observables are a way to handle asynchronous data streams in Angular using RxJS library.
• Observables are similar to promises but can handle multiple values over time.

• They can be used for handling events, HTTP requests, and other asynchronous operations.

• Operators can be used to transform, filter, and combine observables.

• Subscriptions are used to listen to observables and receive data.

• Example: fetching data from an API us...read more
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Q9. What is event loop lifecycle
Ans. 
Event loop is a continuous process that runs in the background and handles all the events in the application.
• Event loop continuously checks for new events in the event queue.

• It processes each event one by one in a synchronous manner.

• If an event takes too long to process, it can block the event loop and cause the application to freeze.

• Event loop can be controlled using setTimeout(), setInterval(), and setImmediate() met...read more
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Q1. Tell me about yourself
Ans. 
I'm a passionate software developer with a strong background in full-stack development and a love for problem-solving.
• Over 5 years of experience in software development, specializing in JavaScript and Python.

• Worked on a project that improved application performance by 30% through code optimization.

• Collaborated with cross-functional teams to deliver high-quality software solutions on time.

• Strong understanding of Agile m...read more
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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. What are your strengths and weaknesses?
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Q4. Tell me about yourself.
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Round duration - 60 Minutes
Round difficulty - Medium

Online Technical Interview ( Coding Round) with 2 medium-hard problem

Q1. 
Trapping Rain Water Problem Statement
You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine th...read more
Ans. 
Calculate the total amount of rainwater that can be trapped between given elevations in an elevation map.
• Iterate through the array to find the maximum height on the left and right of each bar.

• Calculate the amount of water that can be trapped above each bar by taking the minimum of the maximum heights on the left and right.

• Sum up the trapped water above each bar to get the total trapped water for the elevation map.
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Q2. 
Longest Consecutive Sequence Problem Statement
You are provided with an unsorted array/list ARR of N integers. Your task is to determine the length of the longest consecutive sequence present in the array...read more
Ans. 
Find the length of the longest consecutive sequence in an unsorted array of integers.
• Iterate through the array and store each element in a set for constant time lookup.

• For each element, check if it is the start of a sequence by looking for its previous number in the set.

• Update the length of the current consecutive sequence and track the longest sequence found so far.

• Return the length of the longest consecutive sequence...read more
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Round duration - 60 Minutes
Round difficulty - Medium

Online Technical Coding Interview

Q1. 
Stack using Two Queues Problem Statement
Develop a Stack Data Structure to store integer values using two Queues internally.
Your stack implementation should provide these public functions:
Explanation:
...read more
Ans. 
Implement a stack using two queues to store integer values with specified functions.
• Create a stack using two queues internally

• Implement functions for push, pop, top, size, and isEmpty

• Handle edge cases such as empty stack or invalid data

• Ensure the stack functions work correctly and efficiently

• Test the implementation with sample inputs and outputs
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Q2. 
Left View of a Binary Tree
Given a binary tree, your task is to print the left view of the tree. The left view of a binary tree contains the nodes visible when the tree is viewed from the left side.
Inpu...read more
Ans. 
Print the left view of a binary tree, containing nodes visible from the left side.
• Traverse the tree in a level order manner and print the first node at each level.

• Use a queue to keep track of nodes at each level.

• Handle null nodes represented by -1 in the input.
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