Toptal Front end Developer Interview Questions and Answers

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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One coding, 40 technical mcq, 20-30 aptitude

Q1. Js, react questions
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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. 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. Caching Strategy
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Q2. What is micro Frontend architecture
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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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20 MCQs on Aptitude & Quants, can google practice the questions

2 Questions of easy/medium level can select any language and code.

Q1. 40 MCQs on HTML/CSS and React (mainly class components)
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Reasoning logocial thing topics

Coding text web developer development

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
Ans. 
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
Ans. 
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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