TCS IT Analyst C2 Interview Questions, Process, and Tips

Directives in Angular are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or transform it.

• Directives are used to create reusable components or add behavior to existing elements.

• There are three types of directives in Angular: Component, Structural, and Attribute directives.

• Examples of built-in directives in Angular include ngIf, ngFor, and ngStyle.

Pipes are a form of inter-process communication used in Unix-like operating systems to send data between processes.

• Pipes allow communication between processes by connecting the standard output of one process to the standard input of another process

• There are two types of pipes: unnamed pipes and named pipes (also known as FIFOs)

• Unnamed pipes are created using the pipe system call and exist only as long as the processes ...read more

DI system in Angular is a design pattern where dependencies are injected into a class rather than the class creating them.

• DI helps in creating loosely coupled components in Angular applications.

• It allows for easier testing and maintenance of code.

• Dependencies are provided to a component through its constructor.

• Angular's DI system is hierarchical, meaning dependencies can be injected at different levels of the applicati...read more

An HTTP Interceptor is a middleware component that intercepts incoming and outgoing HTTP requests in an application.

• HTTP Interceptors are commonly used in Angular applications to modify or log HTTP requests/responses.

• They can be used to add headers, handle errors, or perform authentication.

• An example of using an HTTP Interceptor is adding an authorization token to every outgoing request for secure API calls.

localStorage and sessionStorage are both web storage options in JavaScript, but they have different scopes and lifetimes.

• localStorage stores data with no expiration date, while sessionStorage stores data for one session only

• localStorage data persists even after the browser is closed and reopened, while sessionStorage data is lost when the browser is closed

• Both can only store strings, but can be converted to other data

Common design patterns in Angular include Singleton, Observer, Factory, and Dependency Injection.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

• Factory pattern is used to create objects without specifying t...read more

Route guards in Angular are used to control access to certain routes in an application.

• Route guards are used to protect routes in Angular applications by controlling whether a route can be activated or not.

• There are three types of route guards in Angular: CanActivate, CanActivateChild, and CanDeactivate.

• CanActivate guard is used to determine if a route can be activated.

• CanActivateChild guard is used to determine if a c...read more

Methods for communication between components include synchronous and asynchronous communication, message queues, APIs, and web services.

• Synchronous communication: Components communicate in real-time, waiting for a response before proceeding.

• Asynchronous communication: Components communicate without waiting for a response, allowing for parallel processing.

• Message queues: Components send messages to a queue for other com...read more

Batch class syntax in Salesforce for processing records in bulk

• Batch class must implement Database.Batchable interface

• Define start, execute, and finish methods

• Use Database.executeBatch method to execute the batch class

• Example: public class MyBatchClass implements Database.Batchable { //code here }