Zidio Development Interview Questions and Answers

Java has reserved keywords that cannot be used as identifiers. Examples include 'class', 'public', and 'void'.

• Java has 50 reserved keywords, such as 'int', 'if', 'else'.

• Keywords like 'class' and 'interface' define structures in Java.

• Identifiers can be any valid name not reserved, e.g., 'myVariable'.

• Examples of non-keywords: 'myClass', 'data', 'value'.

I prioritize tasks by assessing urgency, importance, and deadlines, ensuring efficient project management.

• Assess deadlines: I list all projects and their deadlines to visualize urgency.

• Evaluate importance: I determine which tasks align with project goals and stakeholder needs.

• Use a prioritization matrix: I categorize tasks into urgent vs. important to focus on high-impact activities.

• Break tasks into smaller steps:...read more

useState is a React hook that allows functional components to manage state.

• useState is imported from React: `import React, { useState } from 'react';`

• It initializes state in functional components: `const [count, setCount] = useState(0);`

• The first element is the current state value, and the second is a function to update it.

• State updates are asynchronous and can be batched for performance.

• Example of updating state:...read more

useState manages state in functional components; useEffect handles side effects like data fetching and subscriptions.

• useState is a Hook that allows you to add state to functional components.

• Example: const [count, setCount] = useState(0);

• useEffect is a Hook that lets you perform side effects in function components.

• Example: useEffect(() => { document.title = `Count: ${count}`; }, [count]);

• useState is synchronous ...read more

React.js is a JavaScript library for building user interfaces, focusing on component-based architecture and efficient updates.

• Component-Based Architecture: React enables the creation of reusable UI components, enhancing maintainability and scalability.

• Virtual DOM: It uses a virtual DOM to minimize direct manipulation of the actual DOM, improving performance by only updating changed elements.

• Unidirectional Data Flo...read more

React is a popular JavaScript library for building user interfaces, particularly single-page applications, with a component-based architecture.

• Component-Based Architecture: React allows developers to build encapsulated components that manage their own state, making code reusable and easier to maintain.

• Virtual DOM: React uses a virtual representation of the DOM to optimize rendering, improving performance by minimi...read more

JavaScript is a versatile, high-level programming language primarily used for web development, enabling interactive and dynamic content.

• Dynamic Typing: JavaScript is dynamically typed, meaning variables can hold values of any type without explicit type declaration. Example: `let x = 5; x = 'Hello';`

• Event-Driven: JavaScript is designed to respond to user actions, such as clicks and key presses, making it ideal for ...read more

I actively seek and embrace feedback from senior developers to improve my skills and contribute effectively to the team.

• I regularly ask for code reviews and implement suggestions to enhance code quality.

• During a project, a mentor pointed out a more efficient algorithm; I researched and applied it, improving performance by 30%.

• I maintain an open line of communication, encouraging constructive criticism to foster a ...read more