Seneca Global IT Services Interview Questions and Answers

Q1. React how to reduce unnecessary re-renders
Ans. 
Use React.memo, useCallback, and shouldComponentUpdate to reduce unnecessary re-renders.
• Use React.memo to memoize functional components and prevent re-renders when props don't change.

• Use useCallback to memoize functions and prevent re-creation on every render.

• Use shouldComponentUpdate to prevent class components from re-rendering unnecessarily.

• Avoid using inline functions in render methods as they create new function i...read more
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Q2. What is Polyfill and write polyfill for Array methods
Ans. 
Polyfill is a code that provides modern functionality on older browsers.
• Polyfills are used to fill the gap between modern and older browsers.

• They are written in JavaScript and provide functionality that is not natively supported by the browser.

• Polyfills can be used for Array methods like forEach, map, filter, reduce, etc.

• Here's an example of a polyfill for the Array.prototype.forEach method: Array.prototype.forEach = f...read more
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Q3. Write a program to remove all the duplicates an array
Ans. 
Program to remove duplicates from an array
• Create a new empty array

• Loop through the original array and check if the element already exists in the new array

• If not, add it to the new array

• Return the new array
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Q1. What is Prototype Inheritance
Ans. 
Prototype Inheritance is a way of creating objects based on existing objects.
• It allows objects to inherit properties and methods from other objects.

• It is a feature of object-oriented programming in JavaScript.

• It helps in creating efficient and reusable code.

• Example: A 'Car' object can inherit properties and methods from a 'Vehicle' object.
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Q2. What is different web storages and Does Session storage available in other tab and new window?
Ans. 
Web storages include local storage, session storage, and cookies. Session storage is not available in other tabs or windows.
• Local storage persists even after the browser is closed, while session storage is cleared when the session ends.

• Cookies are used for storing small amounts of data that can be accessed by both the server and client.

• Session storage is only available within the same tab or window where it was created...read more
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Q3. What is IndexDB and how to work with it?
Ans. 
IndexDB is a client-side storage system for web applications.
• It allows storing data in key-value pairs.

• It is an alternative to cookies and local storage.

• It supports transactions for atomic operations.

• It can store large amounts of structured data.

• It can be accessed using JavaScript APIs.
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Q4. What are web sockets and how it works
Ans. 
Web sockets are a communication protocol that allows real-time bidirectional communication between a client and a server.
• Web sockets use a persistent connection between the client and server

• They allow for real-time data transfer without the need for constant HTTP requests

• Web sockets are commonly used in chat applications, online gaming, and stock trading platforms
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Q5. How to add a custom headers to an Axios calls
Ans. 
To add custom headers to an Axios call, use the headers property in the config object.
• Create a config object with the headers property

• Pass the config object as the second argument to the Axios call

• Example: axios.get(url, { headers: { 'Authorization': 'Bearer token' } })
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Q6. What is Event Bubbling and Event Capturing
Ans. 
Event bubbling and capturing are two ways of propagating events in the DOM tree.
• Event bubbling is the process of an event propagating from the innermost element to the outermost element in the DOM tree.

• Event capturing is the opposite of event bubbling, where the event is captured at the outermost element and propagated to the innermost element.

• Event listeners can be added to either the capturing or bubbling phase using...read more
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Online assesment having python mcq questions on topic like oop, basic python datatypes etc.

Q1. Write a python code to identify and arrange non zero and negative integers in a list
Ans. 
Python code to arrange non zero and negative integers in a list
• Iterate through the list and separate non zero and negative integers

• Sort the non zero and negative integers separately

• Combine the sorted lists to get the final result
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Q1. Python, Flask, Database technical discussion
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Q1. Salary negotiation, company fit etc
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Q1. What value can you bring to the organization if hired, and what value do you aim to create for yourself?
Ans. 
I bring strategic leadership and innovative talent acquisition strategies, aiming for mutual growth and organizational excellence.
• Implement data-driven recruitment strategies to enhance talent quality, as seen in my previous role where we reduced time-to-hire by 30%.

• Foster a diverse and inclusive workplace by developing targeted outreach programs, which increased minority hires by 25% in my last organization.

• Leverage t...read more
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Q2. Would you prefer to be a superior performer or an average performer?
Ans. 
I would prefer to be a superior performer, as it drives personal growth and positively impacts the organization.
• Superior performance leads to greater career advancement opportunities, such as promotions and leadership roles.

• Being a superior performer can inspire and motivate team members, fostering a culture of excellence.

• It allows for the development of innovative solutions, as superior performers often think outside ...read more
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Q1. Explain about memory management
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Q2. Explain about UITableViews
Ans. 
UITableViews are a type of view in iOS development used to display data in a scrollable list format.
• UITableViews are commonly used in iOS apps to display lists of data, such as contacts, messages, or settings.

• They consist of rows and sections, with each row representing an item of data.

• UITableViews can be customized with different cell types, styles, and layouts.

• They support features like scrolling, selection, editing,...read more
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Q3. Explain Lazy variable
Ans. 
Lazy variable is a variable that is not evaluated until it is needed.
• Lazy variables are used to defer the initialization of a variable until it is actually accessed or needed.

• They can help improve performance by avoiding unnecessary computations.

• Lazy variables are commonly used in functional programming languages like Swift and Kotlin.
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Q4. Explain about cocoa pods
Ans. 
CocoaPods is a dependency manager for Swift and Objective-C projects.
• CocoaPods is used to easily manage and install third-party libraries in iOS projects.

• It uses a Podfile to specify project dependencies and automatically downloads and integrates them.

• CocoaPods simplifies the process of adding and updating libraries in Xcode projects.

• Example: 'pod 'Alamofire'' adds the Alamofire networking library to a project.
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Q5. Explain about XCTest
Ans. 
XCTest is a testing framework provided by Apple for writing unit tests for Swift and Objective-C code.
• XCTest is integrated into Xcode and allows for writing test methods within test classes.

• Test methods are prefixed with the word 'test' and can be used to verify the behavior of code.

• XCTest provides assertions like XCTAssert, XCTAssertTrue, XCTAssertFalse, XCTAssertEqual, etc. for validating test results.

• Test cases can ...read more
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The GD was good.

Q1. Hr challenges in 2020.
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Q1. What is your family background?
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Q2. Why should we hire you?
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Q3. What are your strengths and weaknesses?
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Q4. Tell me about yourself.
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