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10+ Dana Anand Interview Questions and Answers

Updated 8 Feb 2025
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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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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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Q3. what is the output if u type document in console

Ans.

The output will display the document object in the console.

  • Typing 'document' in the console will return the document object, which represents the current HTML document.

  • The document object provides access to the content and structure of the webpage, allowing manipulation of elements and properties.

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Q4. Hoisting concept with examples and guess the output

Ans.

Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.

  • Variable declarations are hoisted but not their initializations.

  • Function declarations are fully hoisted.

  • Example: console.log(myVar); var myVar = 10; // Output: undefined

  • Example: console.log(myFunc()); function myFunc() { return 'Hello!'; } // Output: Hello!

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Q5. 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>, <figure>, <figcaption>.

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Q6. 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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Q7. 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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Q8. What is DOM, what is the use of that

Ans.

DOM stands for Document Object Model, it is a programming interface for web documents. It represents the structure of a document as a tree of objects.

  • DOM is used to interact with HTML and XML documents in a structured way

  • It allows developers to manipulate the content, structure, and style of a website dynamically

  • DOM provides methods and properties to access and modify elements on a web page

  • Example: document.getElementById('myElement') allows you to access an element with a sp...read more

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Q9. Map functionality with a call back function

Ans.

Using map function to apply a callback function to each element in an array

  • Map function is used to iterate over an array and apply a callback function to each element

  • The callback function can perform operations on each element and return a new value

  • Example: arr.map(item => item * 2) will double each element in the array

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Q10. 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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Q11. Flexbox vs grid, dom, box model,

Ans.

Flexbox is best for one-dimensional layouts, Grid is best for two-dimensional layouts, DOM is the structure of a webpage, Box model is the layout of elements.

  • Flexbox is best for creating one-dimensional layouts like navigation bars or sidebars.

  • Grid is best for creating two-dimensional layouts like grids of images or cards.

  • DOM (Document Object Model) is the structure of a webpage, representing the elements as objects.

  • Box model defines how elements are laid out on a webpage, in...read more

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Q12. 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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Q13. Prop drilling explain in react

Ans.

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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Q14. Redux flow explain

Ans.

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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Q15. Explain closure

Ans.

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() { let outerVar = 'I am outer'; return function innerFunc...read more

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Interview Process at Dana Anand

based on 12 interviews
1 Interview rounds
Technical Round
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