- Variables and Data Types
Manipulating the Document Object Model (DOM)
Once the desired elements are accessed, developers can modify their properties, attributes, and content to create dynamic and interactive web pages. One of the most common properties to modify is the textContent, which allows changing the text inside an element. For example, developers can change the text of a header element to display a personalized greeting or update the content of a paragraph with real-time data fetched from a server.
Beyond modifying text, developers can also change various other properties of elements. For instance, they can update the src attribute of an image element to display a different image or change the color, font, or style of elements using the style property. This dynamic manipulation of elements empowers developers to create visually appealing and interactive user interfaces.
- Understanding the DOM
- Accessing DOM Elements
- Modifying DOM Elements
- Handling Events
Promises are objects that represent the eventual completion (or failure) of an asynchronous operation and provide a more structured and readable way to handle asynchronous tasks. A promise can be in one of three states: pending, fulfilled, or rejected. When a promise is fulfilled, it executes the then method, and when rejected, it executes the catch method. This allows for more straightforward error handling and chaining of asynchronous operations.
However, even with Promises, asynchronous code can still become cumbersome. This led to the introduction of async/await, a modern approach to asynchronous programming. The async keyword is used to declare a function as asynchronous, and the await keyword is used to wait for a promise to be fulfilled before proceeding with the execution of the next line of code. This makes the asynchronous code look more like synchronous code, improving its readability and maintainability.
Asynchronous programming is especially important when dealing with tasks that involve network requests, file reading, or any other operation that might take a considerable amount of time. Without asynchronous programming, the user experience would suffer, leading to unresponsive web applications and frustrated users.
- Using Promises
Promises are objects that represent the eventual completion or failure of an asynchronous operation. They provide a more structured way to handle asynchronous tasks.
- Using Async/Await
Async/await is a more modern and concise way to write asynchronous code. It allows you to write asynchronous operations in a synchronous style.