Hyperface Interview Questions and Answers

Q1. Polyfill for promise
Ans. 
A polyfill is a piece of code that provides the technology that you expect the browser to provide natively.
• Polyfill for promises can be used to add support for promises in older browsers that do not natively support them.

• Popular polyfills for promises include 'es6-promise' and 'bluebird'.

• Polyfills can be included in your project using a script tag or through a package manager like npm.
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This had coding MCQ along with aptitude 15qs in 20mins.

3 questions
1 is database design and rest 2 were dsa

Q1. Pollyfill for promise.allSettled
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Q2. Browser storage in js
Ans. 
Browser storage in JavaScript allows data to be stored locally on the user's device.
• Browser storage includes localStorage and sessionStorage.

• localStorage stores data with no expiration date, while sessionStorage stores data for one session only.

• Data is stored as key-value pairs and can be accessed and manipulated using JavaScript methods like getItem, setItem, and removeItem.
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Q1. Explain debouncing in Javascript
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Debouncing in Javascript is a technique used to limit the number of times a function is called, typically used for handling events like scroll or resize.
• Debouncing involves setting a delay before a function is executed after the last time it was called.

• It helps in optimizing performance by preventing unnecessary function calls, especially for events that trigger frequently.

• Example: Implementing a debounce function for
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Q2. What is the difference between promise.all and promise.race
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promise.all waits for all promises to resolve, while promise.race waits for the first promise to resolve or reject
• promise.all resolves when all promises in the iterable have resolved

• promise.race resolves or rejects as soon as one of the promises in the iterable resolves or rejects

• Example: Promise.all([promise1, promise2, promise3]) will wait for all three promises to resolve before resolving itself

• Example: Promise.race...read more
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Q3. Prototype of caching
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Caching is a technique used to store copies of frequently accessed data in order to speed up retrieval times.
• Caching helps reduce the load on servers by serving cached content instead of generating it from scratch.

• Common types of caching include browser caching, server-side caching, and CDN caching.

• Examples of caching libraries/tools include Redis, Memcached, and Varnish.

• Cache invalidation is an important aspect of cac...read more
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Q4. What is semantic HTML
Ans. 
Semantic HTML is using HTML elements that convey meaning to both the browser and the developer.
• Semantic HTML helps improve accessibility and SEO.

• Examples include using <header>, <nav>, <main>, <article>, <section>, <footer> tags instead of <div> for better structure and meaning.

• Semantic HTML makes it easier for developers to understand the structure of a webpage.
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Q5. Get unique keys in nested object
Ans. 
Use recursion to get unique keys in nested object
• Create a function that takes in an object as input

• Use recursion to iterate through the object and store unique keys in a Set

• Return an array of unique keys from the Set
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Q1. Dsa question of dynamic programming
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Q2. Database design of a website similar to opx
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Database design for a website similar to opx
• Identify the entities and their relationships (e.g. users, products, orders)

• Design tables for each entity with appropriate attributes

• Establish primary and foreign key relationships between tables

• Consider normalization to reduce redundancy and improve data integrity

• Implement indexes for efficient data retrieval
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There was a chef ingredients problem invloving multiple logics, need to solve within 1hr 30 mins

Q1. Low level Design
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Q2. High Level Design
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