FiftyFive Technologies Interview Questions and Answers

Q1. What is Hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.
• Variable declarations are hoisted to the top of the function or global scope.

• Function declarations are also hoisted to the top of the function or global scope.

• However, only the declarations are hoisted, not the initializations.
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Q2. What are hooks in reactjs
Ans. 
Hooks in ReactJS are functions that let you use state and other React features without writing a class.
• Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• Some commonly used hooks are useState, useEffect, useContext, and useReducer.

• Hooks allow you to reuse stateful logic across multiple components without changing the component hierarchy.

• Example: useState hook allows y...read more
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Q1. Closures in javascript
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Closures in JavaScript allow functions to access variables from an outer function even after the outer function has finished executing.
• Closures are created whenever a function is defined within another function.

• Inner functions have access to the outer function's variables even after the outer function has returned.

• Closures can be used to create private variables and functions in JavaScript.

• Example: function outerFuncti...read more
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Q2. Higher order functions in javascript
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Higher order functions in JavaScript are functions that can take other functions as arguments or return functions as output.
• Higher order functions can be used to create more flexible and reusable code.

• Examples include functions like map, filter, and reduce in JavaScript.

• Higher order functions can help with tasks like data manipulation, event handling, and asynchronous programming.
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Q3. Map and reduce functions in javascript
Ans. 
Map and reduce functions are higher-order functions in JavaScript used to transform and aggregate data in arrays.
• Map function applies a function to each element in an array and returns a new array with the results.

• Reduce function applies a function to each element in an array, accumulating a single value.

• Example: const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); const sum = numbers.reduce((acc, cu
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Q4. Record enum in typescript
Ans. 
Enums in TypeScript allow developers to define a set of named constants.
• Define an enum using the 'enum' keyword followed by the enum name and list of constants

• Access enum values using the enum name followed by a dot and the constant name

• Enums can have string or numeric values, and can also be used as types
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Q5. Event loop in js
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Event loop in JavaScript manages asynchronous operations by executing callback functions in a queue.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows non-blocking I/O operations by executing callback functions in a queue.

• Event loop continuously checks the call stack and the callback queue to determine which function to execute next.
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Q6. Sort an array using javascript
Ans. 
Use the sort() method in JavaScript to sort an array of strings.
• Use the sort() method with a compare function to sort the array alphabetically.

• Example: array.sort((a, b) => a.localeCompare(b));
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Q1. Irrelevant questions according to my experience
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Q2. He was asking so low level like a fresher
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Q3. What is docker network, group ?
Ans. 
Docker network group is a way to group containers together and isolate them from other containers on the same network.
• Docker network group allows containers to communicate with each other securely.

• Containers in the same network group can access each other using their container names.

• Network groups can be created using Docker network commands like 'docker network create'.
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Q4. 45min about docker and Kubernetes
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Q1. About yourself and Why marketing
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Q2. What makes you fixated on your goals
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My fixation on goals stems from passion, commitment, and a clear vision of success that drives my actions daily.
• Passion: I genuinely enjoy what I do, which fuels my motivation to achieve my goals. For example, my love for digital marketing keeps me updated with trends.

• Commitment: I set specific, measurable goals and hold myself accountable. For instance, I track my progress weekly to ensure I'm on the right path.

• Vision...read more
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Aptitude Round on DevOps

DevOps related assignment is given by Team

Q1. Question in Docker, Kubernetes, Terraform, AWS, Linux
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Q2. Docker, Kubernetes, Terraform
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Q3. AWS, Linux, docker
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Q1. In TR -2 :- Docker, AWS, Linux, Kubernetes, Terraform
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Q1. Basic Questions Related About you and Company, some scenario based questions.
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Q1. Code for the palindrome string, java oops, JDK, sorting algorithms
Ans. 
The code for a palindrome string in Java using object-oriented programming and JDK.
• Create a Java class with a method to check if a string is a palindrome

• Use the JDK String class methods to manipulate and compare strings

• Implement the logic to reverse the string and compare it with the original string

• Handle cases with spaces, punctuation, and different letter cases

• Test the code with different examples to ensure correctne
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Q1. Quick sorting algorithm, code for fibonacci series, binary search.
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Q2. Simply write the code for quick search - by using the method of divide and conquer, using java language
Ans. 
Code for quick search using divide and conquer method in Java
• Divide the array into two halves

• Compare the target element with the middle element of the array

• If the target element is equal to the middle element, return the index

• If the target element is less than the middle element, search in the left half

• If the target element is greater than the middle element, search in the right half

• Repeat the process until the target
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Q1. What are your expextions from the compay, why do we hire you for this role and a situtaional question
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