AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Shorter syntax of react fragment not working11/22/2023 In most cases the wrapper div is “irrelevant” and is only added because React components require you to return only one element. Usually these elements are wrapped for example inside a div. So what are they and should you start using them? The answer to the latter is YES and the answer for the first question is what this blog post is going to tell you.Īre you new to React? Be sure to read my post 6 Things Every Beginner React Developer Should Know.Īs the React.js docs state, a common pattern in React is for components to return multiple elements. Even though they have been around for a while now, many React developers I have talked to haven’t started to use them yet and the number one reason for this usually is that they have heard of them but haven’t got around to learn about them. Rather than fetching the next result set as the user is scrolling, you can delay the XHR call.React Fragments were introduced in React 16.2.0. This can be used when implementing infinite scrolling, for example. So instead of executing the event handler/function immediately, you’ll be adding a few milliseconds of delay when an event is triggered. In a nutshell, throttling means delaying function execution. In these cases, throttling and debouncing techniques can be a savior without making any changes in the event listener. For example, an XHR request or DOM manipulation that performs UI updates, processes a large amount of data, or perform computation expensive tasks. Higher event trigger rates can sometimes crash your application, but it can be controlled.įirst, identify the event handler that is doing the expensive work. In general, mouse clicks have lower event trigger rates compare to scrolling and mouseover. Throttling and Debouncing Event Action in JavaScriptĮvent trigger rate is the number of times an event handler invokes in a given amount of time. Let’s consider a User List Component: state = )Ĩ. Therefore, we have to be careful when changing the state. When the two are not equal, React will update the DOM. When a component’s props or state changes, React compares the newly returned element with the previously rendered one. React builds and maintains an internal representation of the rendered UI (Virtual DOM). In the React landscape, we use the notion of Component to maintain the internal state of components, and changes to the state can cause the component to re-render. Immutable data objects are simpler to create, test, and use.In my opinion, data immutability is a practice that revolves around a strict unidirectional data flow.ĭata immutability, which comes from the functional programming world, can be applied to the design of front-end apps. This forces you to think about how you structure your application data flow. Using Immutable Data Structuresĭata immutability is not an architecture or design pattern, it’s an opinionated way of writing code. This post will go over some useful techniques you can use to improve your React code. While this will lead to a faster user interface without specifically optimizing for performance for many cases, there are ways where you can still speed up your React application. Internally, React uses several clever techniques to minimize the number of costly DOM operations required to update the UI.
0 Comments
Read More
Leave a Reply. |