Seneca Global IT Services Interview Questions, Process, and Tips

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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer

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.
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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.
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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' } })
Answered by AI
Add your answer
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
Answered by AI
Add your answer

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
Answered by AI
Add your answer

Q1. Python, Flask, Database technical discussion
Add your answer

Q1. Salary negotiation, company fit etc
Add your answer

The GD was good.

Q1. Hr challenges in 2020.
Add your answer

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