SEASON 5 - Wrap up Quiz [OP]

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Why were “let” and “const” introduced in JavaScript (ES6)?

• To replace var entirely
• To provide block-scoped variables and constants
• To improve performance of variable declarations
• To allow variables to be defined without initialization

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What is the main purpose of the JavaScript event loop?

• To handle asynchronous callbacks and tasks
• To manage memory allocation
• To execute synchronous code faster
• To load external libraries

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Why are Promises used in JavaScript?

• To handle synchronous operations
• To store data locally in the browser
• To provide a cleaner and easier way to handle asynchronous operations
• To perform mathematical calculations

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What is the main purpose of the Document Object Model (DOM)?

• To manage the layout of a web page
• To interact with and manipulate HTML documents
• To store user data securely
• To handle server-side logic

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What is the primary purpose of AJAX in web development?

• To create animations
• To style HTML elements
• To handle form validation
• To make asynchronous requests to the server without reloading the page

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Why are Single Page Applications (SPAs) popular in modern web development?

• They load multiple pages for each interaction
• They are easier to maintain than multi-page applications
• They require less JavaScript code
• They provide a smoother and faster user experience by loading a single HTML page and updating content dynamically

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What is the main advantage of hash-based routing in SPAs?

• It allows easy implementation of routing without server-side configuration
• It improves server-side performance
• It reduces JavaScript code size
• It provides better SEO

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What is the main benefit of using JavaScript modules?

• To split code into reusable pieces and avoid global namespace pollution
• To combine all scripts into one file
• To increase the performance of loops
• To provide backward compatibility with older browsers

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What problem do "async" and "await" solve in JavaScript?

• It increases the execution speed of asynchronous functions
• They simplify working with Promises and asynchronous code
• They eliminate the need for error handling
• They automatically optimize performance

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What is the main purpose of the “this” keyword in JavaScript?

• To refer to the global object
• To create new instances of objects
• To refer to the current context or object within a function or method
• To define variables globally