Dhwani Rural Information Systems Flutter Developer Interview Questions and Answers

Q1. Find the second most occurrence of string.
Ans. 
Find the second most occurrence of string in an array of strings.
• Create a dictionary to store the count of each string in the array

• Sort the dictionary by count in descending order

• Return the key of the second element in the sorted dictionary
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Q1. Rate yourself in js, node js, react, MongoDB (separately)
Ans. 
I have a solid understanding of JS, Node.js, React, and MongoDB, with practical experience in building full-stack applications.
• JavaScript: Proficient in ES6+ features, asynchronous programming, and DOM manipulation. Example: Built a dynamic web app using vanilla JS.

• Node.js: Experienced in building RESTful APIs and handling server-side logic. Example: Developed a Node.js API for a task management app.

• React: Skilled in c...read more
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Q2. Typeof null, typeof undefined, typeof {}, typeof NaN
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Q3. What changes came in es6
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Q4. This keyword, closures, hoisting
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Q5. Are let and cont variables hoisted?
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Q6. What is global context
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Q7. What is temporal deadzone
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Q8. What is modules? types of modules in nodejs
Ans. 
Modules in Node.js are reusable blocks of code that encapsulate related functionality.
• Modules in Node.js can be built-in modules like fs (file system) or third-party modules like express.

• Modules help in organizing code into separate files for better maintainability and reusability.

• Modules can be imported using the require() function in Node.js.
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Q9. Index in mongodb, why we need index, is index good or bad?
Ans. 
Indexes in MongoDB improve query performance by allowing the database to quickly locate and retrieve specific documents.
• Indexes help to speed up query performance by allowing the database to quickly locate specific documents based on the indexed fields.

• Without indexes, MongoDB would have to perform a collection scan, which can be slow and resource-intensive.

• Indexes can be created on single fields or compound fields to ...read more
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Q10. What are hooks , use of useRef
Ans. 
Hooks are a feature in React that allow you to use state and other React features in functional components. useRef is a hook that allows you to create a mutable object that persists for the lifetime of the component.
• Hooks are used to add state and lifecycle methods to functional components in React

• useRef is used to create a mutable reference that persists between renders

• useRef can be used to access DOM elements directl...read more
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Q11. Fs module, http module, worker thread?
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Q12. Why we use mongoose not mongodb driver?
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Q1. Leetcode Medium Question -- Container most water
Ans. 
Find two lines that, together with the x-axis, form a container that holds the most water.
• Use two pointers, one at each end of the array.

• Calculate the area formed by the lines at the two pointers.

• Move the pointer pointing to the shorter line inward to potentially find a taller line.

• Repeat until the two pointers meet, keeping track of the maximum area found.

• Example: For heights [1,8,6,2,5,4,8,3,7], the maximum area is 4...read more
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Q1. LLD, Design patterns, Operating system
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Q1. What is oops in python
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Q2. What is ternary operant in python
Ans. 
Ternary operator in Python is a conditional expression that evaluates to a value based on a condition.
• Ternary operator is written as 'value_if_true if condition else value_if_false'

• It is a shorthand way of writing an if-else statement in a single line

• Example: x = 10 if a > b else 20
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Q1. All about core java
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Q2. Front end and My Sql
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Duration is around 1 hour

Q1. 1. Basic programming concepts 2. OOP concepts and basic problem solving skills
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Q1. Programming question
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Q1. 1. Basic questions
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Q1. Second largest number in an array
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Q2. Pairs with given sum
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