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WITS Innovation Lab
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Promises are objects representing the eventual completion or failure of an asynchronous operation.
Promises are used to handle asynchronous operations in JavaScript.
They can be in one of three states: pending, fulfilled, or rejected.
Promises can be chained together using .then() method.
They help in avoiding callback hell and writing cleaner asynchronous code.
Change key value in nested object key is provided
Prototype is an object that is associated with every functions and objects by default in JavaScript.
Prototype is used to add new properties or methods to existing objects or functions.
It allows objects to inherit properties and methods from other objects.
Changing the prototype of an object affects all instances of that object.
Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and interact with each other.
Middleware is used to handle tasks such as authentication, logging, error handling, and more in web applications.
It can modify incoming requests, outgoing responses, or both.
Examples of middleware in Node.js include Express.js middleware like body-parser and morgan.
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posted on 9 May 2017
I appeared for an interview before May 2016.
I appeared for an interview before Aug 2016.
posted on 18 May 2021
I applied via Walk-in and was interviewed before May 2020. There were 4 interview rounds.
For loop is used for iterating over a range of values while for each loop is used for iterating over elements of an array.
For loop is used when the number of iterations is known beforehand.
For each loop is used when the number of iterations is not known beforehand.
For loop can be used with any iterable object.
For each loop can only be used with arrays and other iterable objects.
For loop uses an index variable to access...
I applied via Recruitment Consulltant and was interviewed in May 2024. There were 3 interview rounds.
It is easy to solve the Aptitude question and some identifying outputs of program.
A class is a blueprint for creating objects in object-oriented programming.
A class defines the properties and behaviors of objects.
An object is an instance of a class.
Example: Class 'Car' can have properties like 'color' and 'model', and behaviors like 'drive' and 'stop'.
Swap two numbers without using temp variable and reverse a string without using built-in functions.
To swap two numbers without using temp variable, use bitwise XOR operation.
To reverse a string without using built-in functions, use two pointers approach.
Example for swapping numbers: a = a ^ b; b = a ^ b; a = a ^ b;
Example for reversing a string: use two pointers to swap characters from start and end of the string.
Now, I am preparing for the third round.
So, I don't know the Coding Question.
I applied via Naukri.com and was interviewed in Mar 2023. There were 2 interview rounds.
OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
Inheritance allows a subclass to inherit properties and methods from a superclass.
Polymorphism allows objects to take on multiple forms and behave differently based on their context.
Encapsulation hides the implementation details of an object and only exposes necessary information.
Abstraction allows for the creation of abstract class...
Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.
Inheritance allows for code reuse and extension of existing classes, reducing code duplication.
Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
SQL query for joining tables
Use JOIN keyword to combine two or more tables based on a related column
Specify the columns to be selected using SELECT keyword
Use ON keyword to specify the condition for joining the tables
Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
Implemented inheritance to create a base class and derived classes with specific functionalities.
Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.
Implemented exception handling to handle errors and prevent program crashes.
Used interfaces to define a set of methods that a ...
Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
Overloading is used to provide different ways to call a method with different parameters
Overriding is used to provide a specific implementation of a method in a subclass
Overloading is resolved at compile-time while overriding is r...
posted on 17 Oct 2024
I applied via Campus Placement and was interviewed in Sep 2024. There were 3 interview rounds.
Logical thinking and quantitative
One Java and one SQL and one js question
Collections are data structures that store and organize multiple elements in a single unit.
Collections provide methods to add, remove, and manipulate elements.
Examples of collections include arrays, lists, sets, and maps.
Collections can be used to efficiently manage and access large amounts of data.
A constructor is a special method in a class that is automatically called when an object of that class is created.
Constructors have the same name as the class they belong to
They are used to initialize the object's state
Constructors can have parameters to customize the initialization process
Data science is a field that uses scientific methods, algorithms, and systems to extract knowledge and insights from structured and unstructured data.
Data science involves collecting, analyzing, and interpreting large amounts of data to make informed decisions.
It combines statistics, machine learning, and domain knowledge to uncover patterns and trends in data.
Data scientists use programming languages like Python and R...
I applied via Walk-in and was interviewed before Jun 2023. There was 1 interview round.
An interface in software development defines a contract for classes to implement, specifying methods and properties.
Interfaces in programming languages like Java and C# allow for multiple inheritance by defining a set of methods that a class must implement.
Interfaces provide a way to achieve abstraction and polymorphism in object-oriented programming.
Interfaces are used to define common behavior that multiple classes c...
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
Encapsulation helps in hiding the internal state of an object and restricting access to it.
It allows for better control over the data by preventing direct access from outside the class.
Encapsulation promotes code reusability and makes the code easier to maintain.
Example: In a class representing a car, the variables lik...
10 apti questions and 10 technical mcq on cpp
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