(WGU D277) ITSW 2131 Front-End Web Development Latest Complete FA Guide 2024.

D277 ITSW 2131 Front -End Web Development LATEST COMPLETE FA GUIDE 2024 1. Which of the following is a main purpose of a CSS preprocessor like SASS or LESS? - A) To improve JavaScript performance - B) To create responsive designs - C) To write reusable styles and variables - D) To manage browser compatibility - Correct Answer : C - Rationale: CSS preprocessors allow developers to use v ariables, nesting, and functions, making styles reusable and easier to maintain. 2. In React, what lifecycle method is called immediately after a component is mounted? - A) componentDidUpdate - B) componentWillMount - C) componentDidMount - D) componentWillUnmount - Correct Answer : C - Rationale: `componentDidMount()` is called right after a component is inserted into the DOM, making it a good place for API calls or subscriptions. 3. Which of the following methods can be used to optimize images for web applications? - A) Compressing images - B) Using appropriate file formats (e.g., JPEG for photographs) - C) Lazy loading images - D) All of the above - Correct Answer : D - Rationale: All mentioned methods can significantly improve website loading times and efficiency. 4. What technology does the term "WebAssembly" refer to? - A) A markup language for digital documents - B) A low -level binary format for high -performance web applications - C) A new CSS feature for animations - D) A JavaScript library for creating server -side applications - Correct Answer : B - Rationale: WebAssembly is a binary instruction format designed for safe and efficient execution of code on web browsers. 5. In Angular, what is the purpose of RxJS? - A) To handle HTTP requests easily - B) To manage application states - C) To enable re active programming with observables - D) To create routing mechanisms - Correct Answer : C