Simplotel UI Developer Interview Questions and Answers

Q1. What is react.js? Ans: React.js is javascript library used for building the UI components.
Ans. 
React.js is a JavaScript library used for building user interfaces by creating reusable UI components.
• React.js allows developers to create interactive user interfaces efficiently.

• It uses a virtual DOM for optimal performance by updating only the necessary components.

• React components can be reused across different parts of an application.

• It follows a unidirectional data flow, making it easier to manage state and data.

• Re...read more
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Q2. What is JavaScript? Ans: javaScript is type free language that means to declare the variable we don't any specific datatype and values. javascript is a dynamic type language.
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Q3. Why javascript is Dynamic language? Ans: The type of variable is dynamically changed based on the its current value. that is the reason the javascript is treated as as dynamic language.
Ans. 
JavaScript is considered a dynamic language because variables can change types based on their current value.
• Variables in JavaScript can hold different types of values at different times

• The type of a variable is determined at runtime, not at compile time

• Dynamic typing allows for flexibility and ease of use in JavaScript programming

• Example: a variable can start as a number and then be reassigned as a string
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Q4. How to run the jscode? Ans: In terminal type the node filename.js
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Q1. Why should i hire you? Ans: you should hire me because of i have great skills on the frontend development. and improve the organizations standard with my work and skills.
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Q2. What is salary expection per annum? Ans: upto 600000
Ans. 
My salary expectation is up to 600,000 per annum based on my experience and skills.
• Consider factors such as experience, skills, industry standards, and location when determining salary expectations.

• Research average salaries for front end developers in your area to ensure your expectations are realistic.

• Be prepared to negotiate and discuss other benefits in addition to salary.
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Easy to medium level of leet code

Q1. 1. Fibonacci series with recursion and without recursion 2. String Palindrome 3. Count all repeated numbers from the array
Ans. 
Answering questions related to Fibonacci series, string palindrome, and counting repeated numbers in an array.
• For Fibonacci series with recursion, write a function that calls itself to calculate the next number in the series.

• For Fibonacci series without recursion, use a loop to calculate the series.

• For string palindrome, compare characters from start and end of the string.

• To count all repeated numbers from the array, u
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Q1. 1.Given an array(0-based indexing), you have to find the max sum of i*A[i] where A[i] is the element at index i in the array. The only operation allowed is to rotate(clock-wise or counter clock-wise) the ...read more
Ans. 
Rotate array to find max sum of i*A[i]
• Rotate array to bring maximum element to front

• Calculate sum of i*A[i] for each rotation

• Keep track of maximum sum found
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Q1. 1.Oops concepts 2.Oops code 2.About Java Spring 3. Array stack questions 4.Project discussion
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3 Leetcode style questions , 2 medium , 1 hard .

Q1. Design a cab booking system using oops
Ans. 
A cab booking system designed using OOP principles
• Create classes for Cab, Customer, Driver, and Booking

• Use inheritance and polymorphism to handle different types of cabs and bookings

• Implement methods for booking a cab, assigning a driver, and calculating fare

• Use encapsulation to protect data and ensure data integrity
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Q1. Java and DSA QUESTION, around linked list
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Q2. It was a DSA question
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3 question of basic and 3 mcq

Strings,Sort 0 1 2,invert binary tree

Q1. Project Basics and Technical skills
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Q2. Your Daily routine
Ans. 
My daily routine involves coding, debugging, attending meetings, and learning new technologies.
• Start the day by checking emails and prioritizing tasks

• Code and debug new features or fix existing issues

• Attend team meetings to discuss progress and roadblocks

• Spend time learning new technologies or improving coding skills

• Collaborate with team members on projects
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Q1. DSA Medium difficulty question Schema Design Low level design Amazon reviews page
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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...read more
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Q2. What is curry function
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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
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Q3. Implement curry function
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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.
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Q4. What is promise.all()
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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
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Q5. What is memoization?
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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...read more
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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...read more
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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.
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Q8. Some output questions on SetTimeout to check closure knowledge
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Q9. React lifecycle events
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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...read more
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Q11. Shallow copy vs deep copy
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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...read more
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Q12. How to do deep copy ?
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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.
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Q13. What is hoisting? Some questions on it
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