10+ Vidhema Technologies Interview Questions and Answers

Flatten a nested array into a single-level array.

• Use recursion to iterate through each element of the array.

• If the element is an array, call the function recursively.

• If the element is not an array, add it to the result array.

Code to output 72 by calling add(5,3).mul(9).calc()

• Define a class with add, mul, and calc methods

• add method should add two numbers and return the class instance

• mul method should multiply the result with a number and return the class instance

• calc method should return the final result

• Call the methods in the given order to get the output 72

Code to convert account number to asterisk

• Create a function that takes in an account number as input

• Use string slicing to replace characters with asterisks

• Return the modified account number as output

Creating a custom dropdown component in React using HTML Select tag.

• Create a new component and import React

• Use the HTML Select tag to create the dropdown

• Use the map function to loop through the array of strings and create the options

• Add an onChange event to handle the selection and update the state

• Pass the array of strings as props to the component

Use Node.js fs module to create folder and file structure in React component

• Require fs module in React component

• Use fs.mkdirSync() method to create folder

• Use fs.writeFileSync() method to create file

• Use path.join() method to join folder and file paths

• Handle errors using try-catch block

JS code to convert Roman to decimal number

• Create a map of Roman numerals to their decimal values

• Loop through the Roman numeral string from right to left

• If the current numeral is less than the previous numeral, subtract it from the total

• Otherwise, add it to the total

• Return the total

Polyfill for flat function

• Create a function that takes an array and a depth as arguments

• Use recursion to flatten the array to the specified depth

• If depth is not specified, flatten the array completely

• Return the flattened array

Creating a Todo list component in React

• Create a new React component for the Todo list

• Use state to store the list of tasks

• Render the list of tasks using map()

• Add a form to add new tasks to the list

• Add a button to delete tasks from the list

Create a counter and a to do app on codesandbox platform

• Create a counter component with buttons to increment and decrement the count

• Implement a to do app with input field to add tasks and a list to display them

• Use React or any other front-end framework/library for building the apps