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# OYO Web Developer Interview Experience and Question
- URL: https://developerinsider.co/oyo-web-developer-interview-experience-and-question/
- Published: 2019-10-17T18:30:00.000Z
- Updated: 2021-12-26T16:05:53.000Z
- Author: Guest
- Tags: Interview, OYO, Frontend Developer, JavaScript, HTML, CSS

## Round 1 - Profile Selection (Online)

- Write a polyfill for bind function.
- Given an expression string `exp`, write a program to examine whether the pairs and the orders of `{`,`}`,`(`,`)`,`[`,`]` are correct in exp.  
**Example 1:**  
**Input:** exp = `[()]{}{[()()]()}`  
**Output:** Balanced  
**Example 2:**  
**Input:** exp = `[(])`  
**Output:** Not Balanced
- What is the output of below program and Explain your output

```js
for (var i = 1; i < 5; i++) {
    setTimeout(() >= console.log(i), 1000)  
}

```

- Write a program for debounce function.

## Round 2 - DataStructure and Algorithm

- Write a program to find the intersection of two Linklist.
- Write a program to implement Forward button and Back button for browser.

## Round 3 - HTML, CSS and JavaScript

- What is Doctype?
- How many types of storage we've for a Web Application?
- If there is a for loop running over some time and your browser is not responding on that particular time. What will you do to make browser available and always responding to the user?
- What is Service worker?
- What is Defer and async?
- What is box model?
- What is the difference between inline vs inline-block?
- What is the difference between absolute vs relative position?
- How can you align a div at center?
- What is the difference between svg vs canvas?
- What is pseudo-class?
- What is Javascript Hoisting?
- What is difference between function expression and function declaration?
- Closure

```js
if(i === 1 && i === 2 && i === 3)
    console.log("yes")
else 
    console.log("no")

```

What will you implement `i` so that we always get `yes`?

- Write a program for sum(1)(2)
- What is the difference between forEach vs map?
- What the multiple ways to create object?
- What is the difference between Object.create vs new?
- What is the difference between Shallow copy vs Deep copy?
- Write a program for shallow compare vs deep compare?
- What is the difference between `__proto__` vs `prototype`?
- What is the prototype chain?
- What is Prototype inheritance?
- What is Promise? Why we should have to use it instead of call back?
- What is `async` `await`?
- What is event capturing vs event bubbling?
- How to enable event capturing?
- What is the difference between prevent default vs stop propagation?
- Since both promise and setTimeout is async function which will execute first if both is available in queue at time T?
- what is job queue?
- ES6 feature - What is arrow function and when we have to use it, How it is different from normal function?

## Round 4 - Design

- How to design carousal?
- How to design a search box?
- How to design a listing page like amazon?
- How to design a chat system?
- How to improve web performance and how will you optimize code?
- What is CORS issue?
- What is Modular design pattern?
- Explain about Redux architecture?
- What is Middleware?
- What is Pure component?
- What is props and can we change props value?
- How will communicate between parent to child and vice versa?

## Round 5 - HR Round

- What is your role in your current team?
- Tell about any challenging work you did in the past?
- If there is 4 property in a location in one property almost 90% rooms or bed sold out but in other 3 only 10% sold out, how can you increase the sell?
- Why do you want to join Oyo?