PwC Front end Developer Interview Questions and Answers for Experienced

Q1. Array linked list queue
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Javascript array questions like palindrom and others with aptitude

Q1. Skill related technical questions
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Q2. How to share data in components react
Ans. 
Data can be shared between components in React using props, context, or state management libraries like Redux.
• Use props to pass data from parent to child components

• Use context to share data across multiple components without passing props manually

• Use state management libraries like Redux to manage global state and share data between components
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Q3. Prop drilling explain in react
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Prop drilling is the process of passing data through multiple levels of components in React.
• Prop drilling occurs when a component needs to pass data to a deeply nested child component.

• It can lead to code that is hard to maintain and understand.

• One way to avoid prop drilling is by using Context API or Redux for state management.
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Q4. Redux flow explain
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Redux is a predictable state container for JavaScript apps.
• Redux stores the entire state of an application in a single immutable object.

• State changes are made by dispatching actions, which are plain JavaScript objects.

• Reducers specify how the application's state changes in response to actions.

• Redux flow: Action -> Reducer -> Store -> View
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Q1. Previous project discussion
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2 moderate DSA questions and a Question on React on Api's to fetch data

Q1. HTML CSS JS Angular React Questions
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Q1. How to handle error in javascript
Ans. 
Error handling in JavaScript involves using try-catch blocks, throwing custom errors, and using error objects.
• Use try-catch blocks to catch and handle errors

• Throw custom errors using the throw keyword

• Use error objects like Error, SyntaxError, TypeError, etc. for specific types of errors
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Q2. Explain closure
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Closure is a function that retains access to variables from its parent scope even after the parent function has finished executing.
• Closure allows a function to access and manipulate variables from its outer scope.

• It forms a 'closed-over' scope that persists even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and asynchronous code.

• Example: function outerFunction(...read more
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Basic angular questions like-lazy loading, == === operator etc

Q1. Map function , hashmap
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Q1. What are closures with examples ?
Ans. 
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers and callbacks.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }
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Q2. How to get updated content on scroll on e-commerce app?
Ans. 
Use infinite scrolling to fetch new content as user scrolls down the page.
• Implement infinite scrolling to load more products as user scrolls down

• Make AJAX calls to fetch new content from the server

• Update the DOM with the new content dynamically
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Q1. What are semantic elements in HTML?
Ans. 
Semantic elements in HTML provide meaning to the content, making it easier for search engines and screen readers to interpret.
• Semantic elements are HTML tags that clearly define the content they wrap.

• They provide structure and meaning to the content, making it more accessible and SEO-friendly.

• Examples include <header>, <footer>, <nav>, <article>, <section>, <aside>, <main>, <
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Q2. Difference between html5 and html?
Ans. 
HTML5 is the latest version of HTML with new features and improvements.
• HTML5 supports new elements like <header>, <footer>, <nav>, <article>, <section> etc.

• HTML5 supports new input types like email, url, date, range, color etc.

• HTML5 supports new APIs like Geolocation, Web Storage, Web Workers, Canvas, Audio/Video etc.
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Q1. How to pass data in components using Vue js and react js?
Ans. 
Data can be passed in components using props in Vue.js and React.js.
• In Vue.js, data can be passed down to child components using props.

• In React.js, data can be passed down to child components using props as well.

• In Vue.js, props are defined in the parent component and passed down to the child component.

• In React.js, props are passed down from parent to child components as attributes.
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