Optimum Infosystem Interview Questions and Answers for Experienced

Implementing a FlatList in React Native for efficient data rendering.

• Use FlatList for large data sets to improve performance.

• KeyExtractor prop helps in uniquely identifying items.

• RenderItem prop defines how each item is displayed.

• Use initialNumToRender to optimize initial loading.

• Implement onEndReached for pagination or infinite scrolling.

SOLID principles are a set of five design principles that help make software designs more understandable, flexible, and maintainable.

• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of it...read more

Display flex is a CSS property that allows flexible layout of elements within a container.

• It enables responsive design by automatically adjusting the size and position of elements

• It allows for easy alignment and distribution of elements along the main and cross axis

• It can be used to create complex layouts with minimal code

• It supports both horizontal and vertical layouts

• Example: display: flex; justify-content: cent...read more

Redux flow involves dispatching actions, updating the store, and triggering re-rendering of components.

• Actions are dispatched from components

• Reducers update the store based on the action

• Store notifies subscribed components of state change

• Components re-render with updated state

List comprehension is a concise way to create lists in Python. Constructor is a special method used to initialize objects. Schemas are blueprints for organizing data.

• List comprehension is a shorthand way to create lists in Python

• It is a concise way to write a for loop and append to a list in a single line

• Example: squares = [x**2 for x in range(10)]

• Constructor is a special method used to initialize objects

• It is cal...read more