Connectwise India Interview Questions, Process, and Tips

There are several promise methods in JavaScript, including .then(), .catch(), .finally(), and more.

• Common promise methods include .then(), .catch(), and .finally()

• Other promise methods include .all(), .race(), and .resolve()

• Examples: promise.then(), promise.catch(), promise.finally()

Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.

• Closures allow functions to access variables from their parent function's scope

• They maintain references to their outer scope even after the outer function has finished executing

• Closures are commonly used in event handlers and callbacks

Find and remove duplicates in an array of strings

• Iterate through the array and use a Set to keep track of unique elements

• Check if each element is already in the Set, if so, remove it from the array

Authentication is the process of verifying the identity of a user, while authorization is the process of determining what resources a user can access.

• Authentication can be done using various methods such as username/password, tokens, or biometrics.

• Authorization involves assigning roles or permissions to users based on their identity.

• Authentication and authorization are often implemented using frameworks like OAuth or J...read more

Use SQL query with ORDER BY and LIMIT to find 3rd highest salary

• Use ORDER BY clause to sort salaries in descending order

• Use LIMIT 2,1 to skip first two highest salaries and get the third highest salary

Middlewares are software components that act as a bridge between different applications or systems, facilitating communication and data exchange.

• Middlewares help in managing communication between different software components

• They can provide additional functionalities such as authentication, logging, and error handling

• Examples include Express.js middleware in Node.js applications and middleware in web servers like Apac

Dependency injection is a design pattern in which a class receives its dependencies from external sources rather than creating them itself.

• Allows for easier testing by injecting mock dependencies

• Promotes loose coupling between classes

• Improves code reusability and maintainability

• Commonly used in frameworks like Spring in Java

My project architecture follows a microservices design pattern with a combination of front-end and back-end technologies.

• Utilizes microservices design pattern

• Combination of front-end and back-end technologies

• Uses RESTful APIs for communication between services

Singly linked list has one pointer in each node pointing to the next node, while doubly linked list has two pointers - one pointing to the next node and one pointing to the previous node.

• Singly linked list is more memory efficient as it only requires one pointer per node.

• Doubly linked list allows for traversal in both directions, while singly linked list only allows traversal in one direction.

• Insertions and deletions a...read more

Keywords used in Java programming language

• static keyword is used to create class-level variables and methods

• finally keyword is used in exception handling to define a block of code that will always be executed

• super keyword is used to refer to the superclass of the current object

Polymorphism is the ability of a function or method to behave differently based on the object it is called with.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Types of polymorphism include compile-time (method overloading) and runtime (method overriding) polymorphism.

• Example: Animal superclass with subclasses Dog and Cat. Both Dog and Cat can be treated as Animals.

Microservice architecture involves breaking down a large application into smaller, independent services. Services can communicate with each other through APIs.

• Microservice architecture breaks down a large application into smaller, independent services that can be developed, deployed, and scaled independently.

• Services communicate with each other through APIs, typically using HTTP/REST or messaging protocols like RabbitM...read more

Types of exceptions include checked and unchecked exceptions.

• Checked exceptions are checked at compile time, like IOException.

• Unchecked exceptions are not checked at compile time, like NullPointerException.