If you have any comments or queries about this post, please feel free to mention them in the comments section below. Want to learn more about React? Check out this post on ReactJS Functional Components. With these aspects in mind, we can choose between React Fragment vs Div and make an informed decision. Also, keys cannot be applied to shorthand form of React Fragment i.e. Fragments in React don’t support props other than keys. However, it is also important to know the limitations of React Fragment. In a large application with many components, using React Fragment can have a significant impact. By using React Fragment, we can avoid extra DOM nodes just for wrapping our component HTML nodes. We should use React Fragment when we want to keep our DOM hierarchy simple. This is a major difference between React.Fragment and empty tag. This is common React behavior.Īlso, we can use keys only with React.Fragment. Rather than fetching the next result set as the user is scrolling, you can delay the XHR call.If we don’t use a key with React.Fragment in a list, we get a key related warning. 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. Although, the newer syntax doesnt support keys or attributes. The other one is a new shorter syntax, using empty brackets, that does the same thing. When a component’s props or state changes, React compares the newly returned element with the previously rendered one. Fragments can be used using 2 syntax, the first one is using React.Fragment which weve used multiple times above. 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.
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