Okoders Software Engineer Interview Questions, Process, and Tips

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

• Virtual DOM is a concept in React where a lightweight copy of the actual DOM is created.

• Changes are first made to the virtual DOM, then compared to the actual DOM for efficient updates.

• This helps in minimizing the number of updates needed to be made to the actual DOM, improving performance.

• Popular libraries like React use ...read more

useMemo is used to memoize a value, while useCallback is used to memoize a function.

• useMemo is used to memoize a value and recompute it only when its dependencies change.

• useCallback is used to memoize a function and recompute it only when its dependencies change.

• Example: useMemo can be used to memoize the result of a complex computation, while useCallback can be used to memoize a callback function passed to a child com

Use spaced repetition technique for memorization and practice writing code regularly.

• Use spaced repetition technique to review code regularly

• Practice writing code daily to reinforce memorization

• Break down complex code into smaller chunks for easier memorization

• Use mnemonic devices or visualization techniques to remember code syntax

• Teach someone else the code you've learned to solidify your understanding

Creating a custom input component for a software application.

• Define the input component's functionality and appearance.

• Implement the component using HTML, CSS, and JavaScript.

• Handle user input and validation within the component.

• Consider accessibility and usability when designing the component.

Ref is a special keyword in React used to pass data between components.

• Ref is used to access the DOM nodes or React elements created by a component.

• It is commonly used in cases where direct manipulation of the DOM is necessary, such as focusing an input field or triggering animations.

• Refs should be used sparingly as they bypass React's virtual DOM and can lead to harder-to-maintain code.

• Example: const inputRef = useRef