Toptal Front end Developer Interview Questions and Answers

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. Angular life cycle hooks
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Q2. Single page application
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Related to the Javascript, 1 hour 10 minutes

Q1. 30 minutes with Managerial Round
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Q2. It's good company, working is smooth
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Q1. Angular life cycle, angular loading and some scenarios about authentication
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Q2. Javascript out put based questions based on it's execution
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Q1. Asked about basic javascript and react questions
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Q2. Give some code and asked result
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Q1. Discussion about my previous project
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Q2. Question on html, css, javascript & react
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Q3. Explain about promises
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Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• 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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Q4. Use state, context api
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Q5. Box modelling in css, css pre processors
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Box model in CSS refers to the way elements are rendered in a web page. CSS preprocessors like SASS or LESS help streamline CSS development.
• Box model in CSS includes content, padding, border, and margin.

• CSS preprocessors like SASS or LESS allow for variables, nesting, and mixins to be used in CSS.

• Example: box-sizing: border-box; in CSS changes the box model to include padding and border in the element's total width and
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General aptitude test, coding test, technical test questions

Online Aptitude Test

Q1. React JS Questions
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Q2. Basic Javascript Questions
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Q1. Experience related questions
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Q2. Brief explanation on projects
Ans. 
I have worked on various projects ranging from e-commerce websites to interactive web applications.
• Developed responsive e-commerce website using HTML, CSS, and JavaScript

• Created interactive data visualization tool using D3.js library

• Implemented user authentication and authorization using React and Firebase
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