Genpact Angular Frontend Developer Interview Questions and Answers

Q1. MCQ questioons were there based on angular framework
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Q2. Services mcq were there
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Q1. What is Dependecy Injection
Ans. 
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 reusability and modularity by decoupling components

• Reduces code duplication by centralizing dependency creation

• Example: Angular uses Dependency Injection to provide services to components
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Q2. What is routing
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Routing is the process of navigating between different pages or views in a web application.
• Routing allows users to move between different parts of a web application without reloading the entire page

• It is implemented using a router module in Angular, which maps URLs to components

• Routes can have parameters that can be passed to components for dynamic content

• Routing can be used to create single-page applications (SPAs) wh
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Q1. Basic angular questions
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Q2. Scenario based questions
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Q3. NgRx related questions
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Q1. What is Lazy loading
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Q1. How directives are different from component
Ans. 
Directives are used to add behavior to existing DOM elements, while components are used to create new custom elements.
• Directives are used to manipulate the behavior of existing DOM elements, such as changing their appearance or adding event listeners.

• Components are used to create custom elements with their own templates, styles, and behavior.

• Directives can be structural (like ngIf and ngFor) or attribute-based (like ng...read more
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Q2. What is hoisting
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Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable and function declarations are hoisted to the top of their scope, regardless of where they are declared in the code.

• Only the declarations are hoisted, not the initializations.

• Function declarations are hoisted before variable declarations.
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Q1. Explain design patterns.
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Design patterns are reusable solutions to common problems in software design.
• Design patterns help in creating maintainable, scalable, and efficient code.

• They provide a common language for developers to communicate about solutions to recurring problems.

• Examples of design patterns include Singleton, Factory, Observer, and Strategy patterns.
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Q2. Explain subject. what is replay subject
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ReplaySubject is a type of Subject in RxJS that records multiple values and replays them to new subscribers.
• ReplaySubject is a type of Subject in RxJS

• It records multiple values and replays them to new subscribers

• It has a buffer size that determines how many values to replay
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Q1. Salary discussion
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Q1. Closure in Java script
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Closure in JavaScript allows a function to access variables from its outer scope even after the function has finished executing.
• Closure is created when a function is defined within another function and the inner function references variables from the outer function.

• The inner function maintains a reference to the outer function's scope even after the outer function has finished executing.

• Closures are commonly used in ev...read more
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Q1. Explain promises and types
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation. Types refer to the data types in TypeScript.
• Promises are used for handling asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Types in TypeScript help catch errors early by enforcing data types at compile time.

• Examples: Promise.resolve(), Promise.reject(), string, num
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Q1. Sort array without using merhods
Ans. 
Sort array without using methods
• Iterate through the array and compare each element with the rest to find the correct position

• Swap elements if necessary to sort the array in ascending order

• Repeat the process until the array is fully sorted
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Q2. Reverse string without methods
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Reverse a string without using built-in methods
• Create an empty string to store the reversed string

• Iterate through the input string from the last character to the first

• Append each character to the empty string to reverse the input string
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Q3. How to apply ngclass
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ngClass is used to conditionally apply CSS classes to an element in Angular.
• Use ngClass directive in the template with an object or array of classes and conditions

• Classes are applied when the condition is true, and removed when false

• Example:
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Q4. Angular Interceptors concept ?
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Angular interceptors are a way to intercept HTTP requests and responses to perform operations like logging, modifying requests, or handling errors.
• Interceptors can be used to modify outgoing requests or incoming responses.

• They can be used for tasks like adding headers, logging requests, handling errors, or transforming data.

• Interceptors are implemented as services that implement the HttpInterceptor interface.

• Multiple i...read more
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Q5. Entry point of angular
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The entry point of Angular is typically the main.ts file.
• Main.ts file is the first file that is executed when an Angular application is started.

• It bootstraps the AppModule, which is the root module of the application.

• Main.ts file also imports other necessary modules and components required for the application to run.
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