Balaji Electro Controls Interview Questions and Answers

Find duplicates in list and create dictionary with character count in string.

• Iterate through the list and use a dictionary to keep track of character count.

• For each string in the list, iterate through the characters and add them to the dictionary.

• If the character already exists in the dictionary, increment its count.

• If the character does not exist in the dictionary, add it with a count of 1.

• Finally, iterate through the dictionary and print out the characters and their counts.

Reverse a string without inbuilt functions in Python.

• Create an empty string to store the reversed string.

• Iterate through the original string in reverse order.

• Append each character to the empty string.

• Return the reversed string.

• Alternatively, use slicing to reverse the string: string[::-1].

NGRX can handle large amounts of data by using lazy loading, pagination, and memoization techniques.

• Implement lazy loading to only load data when needed

• Use pagination to limit the amount of data loaded at once

• Utilize memoization to cache results and avoid unnecessary computations

Angular performance optimization involves using best practices to improve the speed and efficiency of Angular applications. ngOnChanges is a lifecycle hook in Angular that is called when a data-bound input property value changes.

• Use trackBy function in ngFor to improve performance when rendering lists

• Lazy load modules to reduce initial load time

• Minimize the use of two-way data binding to avoid unnecessary change detection cycles

• Optimize network requests by using HTTP intercep...read more

NodeJS is a runtime environment that allows you to run JavaScript on the server side.

• NodeJS is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model.

• NodeJS is commonly used for building server-side applications and APIs.

• npm (Node Package Manager) is used for managing dependencies in NodeJS projects.

To handle different frames in Selenium, switch to the frame using various methods like index, name, id, or WebElement.

• Use driver.switchTo().frame(int index) to switch to a frame by its index

• Use driver.switchTo().frame(String nameOrId) to switch to a frame by its name or id

• Use driver.switchTo().frame(WebElement frameElement) to switch to a frame by locating the frame element

Designing script for test cases for random demo applications

• Identify key functionalities of the demo application

• Create test cases covering different scenarios like login, search, add to cart, checkout

• Use automation tools like Selenium or Appium to write scripts

• Implement data-driven testing to cover various input combinations

ngrx is a state management library for Angular applications.

• ngrx follows the Redux pattern for managing application state

• It uses actions, reducers, and selectors to manage state changes

• State changes are handled immutably to ensure predictability and maintainability