Hitachi Energy Software Developer Interview Questions and Answers

The virtual DOM is a lightweight representation of the actual DOM, optimizing updates and rendering in web applications.

• The virtual DOM is a JavaScript object that mirrors the structure of the real DOM.

• When changes occur, the virtual DOM is updated first, minimizing direct manipulation of the real DOM.

• React uses a reconciliation algorithm to efficiently update the real DOM by comparing the virtual DOM with the previous...read more

Map, reduce, and filter are higher-order functions commonly used in functional programming to manipulate arrays.

• Map: Transforms each element in an array based on a provided function.

• Reduce: Reduces an array to a single value by applying a function to each element.

• Filter: Creates a new array with elements that pass a certain condition.

Closures are functions that have access to variables from their containing scope.

• Closures can access variables from their outer function even after the outer function has finished executing.

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

• Closures are commonly used in event handlers and callbacks.

Redux sagas are middleware libraries for managing side effects in Redux applications.

• Redux sagas are used to handle asynchronous actions in Redux, such as API calls or timers.

• They are implemented as generator functions that can pause and resume execution.

• Redux sagas provide a more structured and testable approach to handling side effects compared to traditional Redux middleware like Thunk.

• Common use cases for redux sag...read more

Function to find sum of array using reduce

• Use the reduce method to iterate through the array and accumulate the sum

• Convert array elements to numbers before summing them up

• Handle edge cases like empty array or non-numeric elements

• Example: const array = ['1', '2', '3']; const sum = array.reduce((acc, curr) => acc + Number(curr), 0);

Hitachi Energy is a global technology leader that provides innovative and sustainable energy solutions.

• Hitachi Energy offers a wide range of products and services for the energy sector, including grid integration, digital solutions, and consulting services.

• The company focuses on creating a more sustainable energy future through its advanced technologies and expertise.

• Hitachi Energy is known for its commitment to innova...read more

I want to join Hitachi Energy to contribute to innovative energy solutions and be part of a sustainable future.

• Hitachi Energy is a leader in sustainable energy solutions, aligning with my passion for renewable technologies.

• The company's commitment to innovation, such as smart grids and energy management systems, excites me.

• I admire Hitachi Energy's focus on digital transformation in the energy sector, which presents op...read more