Filter interviews by
Clear (1)
To delete duplicate values, use SQL queries with DISTINCT keyword or programming languages like Python with sets.
In SQL, use SELECT DISTINCT to retrieve unique values
In Python, convert list to set to automatically remove duplicates
Use pandas library in Python to drop duplicates in a DataFrame
I applied via Campus Placement and was interviewed in Sep 2024. There was 1 interview round.
Interview: resume,puzzles, guesstimates
I applied via LinkedIn and was interviewed in Aug 2024. There were 2 interview rounds.
Aptitude questions asked about basic stuff
Project explanation
MasterCard interview questions for designations
Top trending discussions
I was interviewed in Jun 2017.
Ajax calls allow for asynchronous communication between client and server without reloading the page.
Ajax stands for Asynchronous JavaScript and XML
Uses XMLHttpRequest object to send and receive data
Allows for partial page updates without reloading the entire page
Can handle data in various formats such as JSON, XML, HTML, and plain text
Example: $.ajax({url: 'example.com', success: function(data){console.log(data)}});
REST is lightweight and uses HTTP while SOAP is XML-based and has more features.
REST uses HTTP methods like GET, POST, PUT, DELETE while SOAP uses XML messaging.
REST is stateless while SOAP can maintain state.
REST is faster and easier to use while SOAP is more secure and reliable.
REST is used for web services while SOAP is used for enterprise-level services.
Example of REST: Twitter API. Example of SOAP: Amazon Web Serv
GET and POST are HTTP methods used for sending data to a server.
GET is used to retrieve data from a server
POST is used to submit data to a server
GET requests can be cached and bookmarked
POST requests are not cached and cannot be bookmarked
GET requests have length restrictions
POST requests have no length restrictions
GET requests are less secure than POST requests
Observer pattern is a design pattern in which an object maintains a list of its dependents and notifies them automatically of any state changes.
Also known as publish-subscribe pattern
Used in event-driven systems
Allows loose coupling between objects
Example: A weather station broadcasts weather updates to multiple displays
Example: A stock market ticker notifies multiple investors of stock price changes
Singleton is a design pattern that restricts the instantiation of a class to a single object.
Singleton ensures that only one instance of a class exists in the entire application.
It provides a global point of access to the instance.
Commonly used in scenarios where a single instance needs to coordinate actions across the system.
Example: Database connection manager, logger, configuration manager.
Immutable in Java refers to objects whose state cannot be changed after creation.
String, Integer, and other wrapper classes are immutable in Java.
Immutable objects are thread-safe and can be shared without synchronization.
To create an immutable class, make all fields final and private, and don't provide setters.
Examples of immutable classes in Java include LocalDate, LocalTime, and LocalDateTime.
Creating immutable in Java
Use final keyword to make variables immutable
Use private constructor to prevent object modification
Use defensive copying to prevent modification of mutable objects
Use enum to create immutable objects
Use String class to create immutable strings
Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.
It helps to decouple the code and makes it more testable and maintainable.
It allows for easier swapping of dependencies without changing the code.
There are three types of dependency injection: constructor injection, setter injection, and interface injection.
Example: Instead of creating a database co...
CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented in web browsers to restrict access to resources from different origins.
CORS allows web servers to specify which origins are allowed to access its resources
It is implemented using HTTP headers
CORS prevents malicious websites from accessing sensitive data from other websites
Examples of resources that may be restricted by CORS include cook
CORS can be overcome by configuring the server to allow cross-origin requests.
Configure the server to include the Access-Control-Allow-Origin header
Use JSONP (JSON with Padding) to bypass CORS restrictions
Use a proxy server to make the request on behalf of the client
Use a browser extension to disable CORS restrictions during development
Use a server-side proxy to forward requests to the target server
Autocomplete in IDEs helps developers write code faster by suggesting code snippets and completing code as they type.
Autocomplete should suggest code snippets based on the context of the code being written
Autocomplete should prioritize suggestions based on frequency of use
Autocomplete should also suggest variable and function names
Autocomplete should be customizable to allow for user-defined snippets and suggestions
Exa...
My weakness is public speaking.
I tend to get nervous when speaking in front of large groups.
I am working on improving my public speaking skills by practicing and seeking feedback.
I have taken courses and attended workshops to help me overcome my fear of public speaking.
Comparing 2 basketball game scenarios with different number of trials and baskets required to win
Calculate the probability of winning in each game scenario using binomial distribution formula
Compare the probabilities to determine which game scenario is preferable
In game1, the probability of winning is p. In game2, the probability of winning is the sum of probabilities of making 2 or 3 baskets
If p is high, game1 is pref...
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
Implement Binary Search Tree using given array of strings.
Sort the array in ascending order
Find the middle element and make it the root of the tree
Recursively create left and right subtrees using the left and right halves of the array
Repeat until all elements are added to the tree
Print the given Binary search tree in ascending order
Traverse the left subtree recursively
Print the root node
Traverse the right subtree recursively
Find buy and sell points for maximum profit in an array of stock prices in O(n)
Iterate through the array and keep track of the minimum price seen so far
Calculate the profit at each index by subtracting the minimum price from the current price
Update the maximum profit and buy/sell points accordingly
Return the buy and sell points for maximum profit
Chennai faces problems related to water scarcity, traffic congestion, and pollution.
Water scarcity due to inadequate rainfall and poor management of water resources.
Traffic congestion due to the increasing number of vehicles and poor road infrastructure.
Pollution caused by industries, vehicular emissions, and improper waste disposal.
Need more context on the question to provide an answer.
Please provide more information on the problem to be solved.
Without context, it is difficult to provide a solution.
Can you please provide more details on the problem statement?
Visa is a global payments technology company that connects consumers, businesses, banks and governments in more than 200 countries and territories.
Visa operates the world's largest retail electronic payments network.
VisaNet, the company's global processing system, handles more than 65,000 transaction messages a second.
Visa is constantly innovating to improve payment security and convenience, with initiatives such as Vi...
based on 5 interviews
Interview experience
based on 5 reviews
Rating in categories
Senior Software Engineer
694
salaries
| ₹0 L/yr - ₹0 L/yr |
Software Engineer2
258
salaries
| ₹0 L/yr - ₹0 L/yr |
Software Engineer
236
salaries
| ₹0 L/yr - ₹0 L/yr |
Consultant
183
salaries
| ₹0 L/yr - ₹0 L/yr |
Lead Software Engineer
146
salaries
| ₹0 L/yr - ₹0 L/yr |
PayPal
Visa
American Express
Discover Financial Services