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Zepto Front end Developer Interview Questions, Process, and Tips
Zepto Front end Developer Interview Experiences
1 interview found
Satyam Rohela
I applied via Naukri.com and was interviewed in Nov 2022. There were 2 interview rounds.
(13 Questions)
- Q1. What is denbouncer and throttle
- Ans.
Debouncer and throttle are techniques used to limit the frequency of function calls.
Debouncing delays the execution of a function until a certain amount of time has passed without the function being called again.
Throttling limits the frequency of function calls to a certain rate, executing the function at fixed intervals.
Debouncing is useful for events that may be triggered multiple times in quick succession, such as r...
- Q2. What is curry function
- Ans.
Currying is a technique of transforming a function that takes multiple arguments into a sequence of functions that each take a single argument.
Currying allows partial application of a function
It helps in creating reusable functions
Curried functions are easier to compose and chain
Example: const add = (a) => (b) => a + b; add(2)(3) returns 5
- Q3. Implement curry function
- Ans.
Curry function is a higher-order function that allows partial application of arguments.
Currying transforms a function that takes multiple arguments into a series of functions that take one argument each.
It returns a new function until all the arguments are received and then executes the original function.
Example: const add = (a, b) => a + b; const curriedAdd = curry(add); curriedAdd(2)(3) returns 5.
- Q4. What is promise.all()
- Ans.
promise.all() is a method that takes an array of promises and returns a new promise that resolves when all promises in the array have resolved.
It is used to handle multiple asynchronous operations simultaneously.
If any of the promises in the array rejects, the returned promise will be rejected with the reason of the first rejected promise.
The resolved values of the promises are returned as an array in the same order as
- Q5. What is memoization?
- Ans.
Memoization is a technique of caching the results of a function to improve performance.
Memoization is used to avoid redundant calculations by storing the results of a function and returning the cached result when the same inputs occur again.
It is commonly used in recursive functions and functions with expensive computations.
Memoization can be implemented manually or by using libraries like Lodash or Memoizee.
Example: M...
- Q6. What is closure in javascript
- Ans.
Closure is a function that has access to its parent scope even after the parent function has returned.
Closure allows for private variables and functions in JavaScript.
It is created when a function returns another function.
The inner function has access to the outer function's variables and parameters.
Example: function outer() { let x = 10; return function inner() { console.log(x); } }
The inner function can access and mo...
- Q7. What is the problem with colosures
- Ans.
Closures can cause memory leaks if not handled properly.
Closures can hold references to variables outside of their scope, preventing them from being garbage collected.
If closures are used excessively or not released properly, they can cause memory leaks.
To avoid memory leaks, make sure to release closures when they are no longer needed.
- Q8. Some output questions on SetTimeout to check closure knowledge
- Q9. React lifecycle events
- Q10. Major difference between class based components and class based components
- Ans.
There is no difference between class based components and class based components.
There seems to be a typo in the question.
Assuming the question is about functional components vs class components, the major difference is that class components use a class to define the component while functional components are defined as functions.
Class components have access to lifecycle methods while functional components do not.
Functi...
- Q11. Shallow copy vs deep copy
- Ans.
Shallow copy only copies the reference to an object while deep copy creates a new object with a new memory address.
Shallow copy is faster and uses less memory than deep copy.
In shallow copy, changes made to the original object will reflect in the copied object as well.
Deep copy creates a completely new object with its own memory space.
In JavaScript, arrays and objects are assigned by reference, so a shallow copy will o...
- Q12. How to do deep copy ?
- Ans.
Deep copy creates a new object with the same values as the original object.
Use Object.assign() method to create a deep copy of an object.
For nested objects, use recursion to copy all levels.
For arrays, use slice() method to create a new array with the same values.
Avoid using spread operator for deep copy as it only creates a shallow copy.
- Q13. What is hoisting? Some questions on it
Interview Preparation Tips
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
Front end Developer Interview Questions & Answers
Shiprocket Private Limited
Anonymous
posted on 25 Nov 2024
(1 Question)
- Q1. How to detect and prevent Memory leak
- Ans.
Memory leaks can be detected and prevented by monitoring memory usage, using memory profiling tools, avoiding circular references, and properly managing event listeners.
Monitor memory usage regularly to identify any abnormal increases.
Use memory profiling tools like Chrome DevTools or Valgrind to analyze memory usage.
Avoid creating circular references in your code, as they can prevent objects from being garbage collect...
(1 Question)
- Q1. Advanced JS questions
Interview Preparation Tips
Selected
I applied via Campus Placement and was interviewed in Feb 2024. There were 2 interview rounds.
Question are very tough and faad
Question like trees linked list and graphs
Interview Preparation Tips
Selected
I applied via Referral and was interviewed before Apr 2023. There were 3 interview rounds.
(2 Questions)
- Q1. Max sum path in tree
- Ans.
Find the maximum sum path in a tree from root to leaf node.
Start from the root node and traverse down to leaf nodes, keeping track of the sum at each node.
At each node, compare the sum of the current path with the maximum sum found so far.
Choose the path with the maximum sum as the final result.
- Q2. Array 2 sum problem
(2 Questions)
- Q1. React: Create a Timer
- Ans.
Create a simple timer using React
Use state to store the timer value
Use setInterval to update the timer every second
Display the timer value in the component's render method
- Q2. Javascript: implement Debounce
(2 Questions)
- Q1. What do you know about the company + common behaviour question
- Q2. About roles in previous org
Skills evaluated in this interview
CodingNinjas
I was interviewed in Sep 2021.
(2 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
Mostly focused on Data Structure & Algorithm
- Q1. Rotate Linked List
You have been given a Linked List having ‘N’ nodes and an integer ‘K’. You have to rotate the Linked List by ‘K’ positions in a clockwise direction.
Example :
Given Linked List : 1 2... - Ans. Brute Force
Find the length of the Linked List to check whether the ‘K’ is greater than the Length of the Linked List or not. Take a modulo of ‘K’ with its length if it is greater than the length. Reach the (‘K’+1)th node from last and change the pointers of nodes to get a rotated Linked List.
Here is the algorithm:
- Base Condition : If ‘HEAD’ is equal to ‘NULL’ or ‘K’ is equal to 0, then return ‘HEAD’ of the L...
- Q2. Reverse the order of words in a string
You are given a string ‘STR’ containing space-separated words. A word is a sequence of non-space characters. Your task is to reverse the order of words in ‘STR’.
No...
- Ans. Convert to an array of words
Use an array ‘ARR’ to store the words in ‘STR’. Traverse the string ‘STR’ and append each word at the end of ‘ARR’. Use the string ‘RES’ to store the answer. Traverse the array ‘ARR’ in reverse and append the words in ‘ARR’ to ‘RES’ followed by a whitespace character.
- Create an empty array of string ‘ARR’.
- Initialize an empty string ‘CUR_STR’. Use it to store a single word from ‘STR’.
- Run...
(1 Question)
Round duration - 50 Minutes
Round difficulty - Medium
JavaScript core concepts with some examples and problem discussion
- Q1. Javascript Questions
1) What is currying in Javascript?
2) Explain hoisting with a code snippet.
3) What does this return (typeof null) ?
4) What is callback hell?
(1 Question)
Round duration - 30 Minutes
Round difficulty - Easy
- Q1. Basic HR Questions
Why should we hire you?
What keeps you motivated?
Interview Preparation Tips
Tip 1 : JavaScript from javascript.info and Akshay Saini videos
Tip 2 : Practise CSS styling for big web apps like Amazon, Flipkart etc
Tip 3 : Practice writing custom hooks and react code optimization.
Tip 1 : Write skills which you know only and be confident about it.
Tip 2 : Also, do mention the project's that you have done in your current company or as a part of your self learning.
Skills evaluated in this interview
I applied via Referral and was interviewed in Feb 2024. There was 1 interview round.
(1 Question)
- Q1. Polyfill for bind Closures Call apply bind let const var lexical environment scope output questions
Front end Developer Interview Questions & Answers
Shiprocket Private Limited
Anonymous
posted on 13 May 2024
Selected
I was interviewed before May 2023.
Coding test in javascript
(2 Questions)
- Q1. React js questions
- Q2. Angular js questions
Interview Preparation Tips
Selected
I applied via Campus Placement and was interviewed in Feb 2024. There were 2 interview rounds.
Question are very tough and faad
Question like trees linked list and graphs
Interview Preparation Tips
Selected
I applied via Referral and was interviewed before Apr 2023. There were 3 interview rounds.
(2 Questions)
- Q1. Max sum path in tree
- Ans.
Find the maximum sum path in a tree from root to leaf node.
Start from the root node and traverse down to leaf nodes, keeping track of the sum at each node.
At each node, compare the sum of the current path with the maximum sum found so far.
Choose the path with the maximum sum as the final result.
- Q2. Array 2 sum problem
(2 Questions)
- Q1. React: Create a Timer
- Ans.
Create a simple timer using React
Use state to store the timer value
Use setInterval to update the timer every second
Display the timer value in the component's render method
- Q2. Javascript: implement Debounce
(2 Questions)
- Q1. What do you know about the company + common behaviour question
- Q2. About roles in previous org
Skills evaluated in this interview
I was interviewed in Sep 2021.
(2 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
Mostly focused on Data Structure & Algorithm
- Q1. Rotate Linked List
You have been given a Linked List having ‘N’ nodes and an integer ‘K’. You have to rotate the Linked List by ‘K’ positions in a clockwise direction.
Example :
Given Linked List : 1 2... - Ans. Brute Force
Find the length of the Linked List to check whether the ‘K’ is greater than the Length of the Linked List or not. Take a modulo of ‘K’ with its length if it is greater than the length. Reach the (‘K’+1)th node from last and change the pointers of nodes to get a rotated Linked List.
Here is the algorithm:
- Base Condition : If ‘HEAD’ is equal to ‘NULL’ or ‘K’ is equal to 0, then return ‘HEAD’ of the L...
- Q2. Reverse the order of words in a string
You are given a string ‘STR’ containing space-separated words. A word is a sequence of non-space characters. Your task is to reverse the order of words in ‘STR’.
No...
- Ans. Convert to an array of words
Use an array ‘ARR’ to store the words in ‘STR’. Traverse the string ‘STR’ and append each word at the end of ‘ARR’. Use the string ‘RES’ to store the answer. Traverse the array ‘ARR’ in reverse and append the words in ‘ARR’ to ‘RES’ followed by a whitespace character.
- Create an empty array of string ‘ARR’.
- Initialize an empty string ‘CUR_STR’. Use it to store a single word from ‘STR’.
- Run...
(1 Question)
Round duration - 50 Minutes
Round difficulty - Medium
JavaScript core concepts with some examples and problem discussion
- Q1. Javascript Questions
1) What is currying in Javascript?
2) Explain hoisting with a code snippet.
3) What does this return (typeof null) ?
4) What is callback hell?
(1 Question)
Round duration - 30 Minutes
Round difficulty - Easy
- Q1. Basic HR Questions
Why should we hire you?
What keeps you motivated?
Interview Preparation Tips
Tip 1 : JavaScript from javascript.info and Akshay Saini videos
Tip 2 : Practise CSS styling for big web apps like Amazon, Flipkart etc
Tip 3 : Practice writing custom hooks and react code optimization.
Tip 1 : Write skills which you know only and be confident about it.
Tip 2 : Also, do mention the project's that you have done in your current company or as a part of your self learning.
Skills evaluated in this interview
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