Eternal Infotech Front end Developer Interview Questions, Process, and Tips

Q1. What is event bubbling
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Q2. What is TDD and why TDD
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Reactive form and crud operations pipes crud operations

Q1. Basic understanding of js and angular is must expeciallly how js works questions on arrays objects shallow deep copy
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Q1. Caching Strategy
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Q2. What is micro Frontend architecture
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Micro Frontend architecture is an approach to building front-end applications by breaking them down into smaller, independently deployable units.
• Allows different teams to work on separate parts of the application

• Each micro frontend can be developed using different technologies

• Enables incremental upgrades and updates without affecting the entire application

• Can improve performance by loading only the necessary components

• ...read more
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Q3. Pure and impure pipes in angular
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Pure pipes in Angular are stateless and do not change the input data, while impure pipes can have side effects and change the input data.
• Pure pipes are used for simple transformations like formatting dates or numbers.

• Impure pipes are used for more complex transformations that require state or side effects.

• Pure pipes are faster and more efficient as they only run when a pure change to the input data is detected.

• Impure p...read more
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Q4. How to make singleton services multiton
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Singleton services can be made multiton by maintaining a map of instances with unique keys.
• Create a map to store instances with unique keys

• Use a factory method to retrieve instances based on keys

• Ensure that only one instance is created per key
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Q5. What is dependency injection
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Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.
• Allows for easier testing by injecting mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: AngularJS, Spring Framework
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Q1. CSS Box-model definition
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CSS Box-model defines how elements are rendered in a webpage, including padding, border, and margin.
• Box-model consists of content, padding, border, and margin

• Content area is where text or images are displayed

• Padding is the space between content and border

• Border is the line around the content and padding

• Margin is the space outside the border
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Q2. Difference b/n flexbox and grid
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Flexbox is for one-dimensional layouts, grid is for two-dimensional layouts.
• Flexbox is best for arranging items in a single row or column.

• Grid is best for creating complex layouts with rows and columns.

• Flexbox is more suitable for smaller scale layouts, while grid is better for larger scale layouts.

• Flexbox is more flexible in terms of item order and sizing, while grid provides more control over the overall layout.

• Both
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Q1. Change Detection
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Q2. Subjects & types
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Q1. What is mean by dom
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DOM stands for Document Object Model, which is a programming interface for web documents.
• DOM is a representation of the structure of a web page, allowing scripts to dynamically access and update the content, structure, and style of the page.

• It provides a way for scripts to interact with the elements on a web page, such as changing text, styles, and attributes.

• DOM is hierarchical, with elements nested inside other eleme...read more
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Q2. Explain promise in typescript
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Promises in TypeScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in a more readable and manageable way.

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

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Example: const myPromise = new Promise((resolve, reject) => { ...
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Q3. Explain hooks in javascript
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Hooks in JavaScript are functions that let you use state and other React features without writing a class.
• Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• Custom hooks are functions that allow you to reuse
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Q4. Write a program 1 to 100 prime numbers
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Generate an array of prime numbers from 1 to 100.
• Iterate from 1 to 100 and check if each number is prime

• A prime number is only divisible by 1 and itself

• Start with a list of prime numbers and check divisibility
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2 DSA questions. Both medium level difficult