Mercedes-Benz Research and Development India Senior Software Engineer Interview Questions, Process, and Tips

Closures are functions that have access to variables from their containing scope even after the scope has closed.

• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• They are commonly used in event handlers, callbacks, and asynchronous programming.

• Closures help in maintaining state in functional programming.

Virtual DOM is a lightweight copy of the actual DOM used for efficient updates in web development.

• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed.

• This approach reduces the number of costly DOM operations, resulting in faster rende

Data types in JavaScript include number, string, boolean, object, function, undefined, and null.

• Number - represents numeric data, e.g. 10, 3.14

• String - represents textual data, e.g. 'hello', '123'

• Boolean - represents true or false values, e.g. true, false

• Object - represents complex data structures, e.g. { key: 'value' }

• Function - represents executable code, e.g. function() { }

• Undefined - represents a variable that has ...read more

React code for a simple counter

• Create a functional component for the counter

• Use useState hook to manage the count state

• Render the count value and buttons to increment and decrement the count

Yield keyword is used in Python to pause and resume a generator function.

• Yield keyword is used to return a value from a generator function and pause its execution.

• When the generator function is called again, it resumes from where it was paused.

• Yield can be used in a loop to generate a sequence of values without storing them all in memory.

• Example: def my_generator(): yield 1 yield 2 yield 3

Use variadic arguments in C++ to handle variable number of parameters in a function

• Use variadic arguments in C++ to create a function that can accept any number of parameters

• Example: void myFunction(int firstParam, ...)

• Access the parameters using va_list and va_start macros

• Example: va_list args; va_start(args, firstParam); int nextParam = va_arg(args, int);

• End the argument list with va_end macro

SQL join query combines data from multiple tables based on a related column, and aggregate functions perform calculations on grouped data.

• Use JOIN keyword to combine data from multiple tables based on a related column

• Use aggregate functions like SUM, AVG, COUNT, etc. to perform calculations on grouped data

• Example: SELECT orders.order_id, SUM(order_details.quantity) FROM orders JOIN order_details ON orders.order_id = or

I follow the Agile software management framework and am familiar with various Scrum terminologies.

• Agile software management framework focuses on iterative development and collaboration.

• Scrum is a specific Agile framework that includes roles like Scrum Master and Product Owner.

• Some Scrum terminologies include Sprint, Daily Standup, Backlog, and User Stories.