HCL Group Angular Frontend Developer Interview Questions, Process, and Tips

Q1. What is data binding ?
Ans. 
Data binding is the automatic synchronization of data between the model and view components in an application.
• Data binding allows for the seamless updating of data in the model to be reflected in the view and vice versa.

• There are two-way data binding and one-way data binding.

• Two-way data binding updates the model and view simultaneously, while one-way data binding updates in one direction only.

• Example: In Angular, usin...read more
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Q2. Do you know lazy loading?
Ans. 
Lazy loading is a technique used to defer loading of non-essential resources until they are actually needed.
• Lazy loading helps improve performance by only loading resources when they are required.

• In Angular, lazy loading is commonly used for loading modules on demand rather than loading everything upfront.

• Lazy loading can be implemented using Angular's RouterModule and loadChildren feature.
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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
Ans. 
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. What are the time queue, etc in API
Ans. 
Time queue in API refers to managing requests in a sequential order.
• Time queue ensures that API requests are processed in the order they are received.

• It helps in preventing overload on the server by limiting the number of concurrent requests.

• Examples include using promises or async/await in JavaScript to handle API calls sequentially.
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Q2. What is the meaning of preflight in API? (All questions are related to dev oops profile. I applied for Angular)
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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. Pipes in angular
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Q2. Lifecycle hooks
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