![]() Originally published at on October 6, 2019. As a professional programmers that we are, we must give meaning and name our objects. Both of them are React components, no need for callers to check it. If there is no items, a React.Fragment component is returned. The most obvious and common prop that developers work with within React is the children prop. If items is not empty, a ul node is returned plus a li node per item inside, a React component in fact. I also share exclusive tips and tricks for the newsletter subscribers! You can subscribe here. In particular, we will deep dive into one of the utility methods,, that React gives us, which helps to iterate over the children in a way which ensures performance and determinism. What do you think about React fragments and are you using them in your own projects? Please leave a comment below, I would love to hear from you!Īlso remember to subscribe to my newsletter, to stay tuned on the latest news and posts about modern web development. Transforming Elements Reactprovides several APIs for manipulating elements: cloneElement() isValidElement() React.Children Fragments Reactalso provides a component for rendering multiple elements without a wrapper. So the fact that fragments eliminate the wrapper div which can cause problems with invalid HTML and with styling of the components plus the fact that they are faster and the DOM is less cluttered, Iâd say they are worth using. createElement() createFactory() See Using React without JSXfor more information. ![]() Some CSS mechanisms like Flexbox and CSS Grid have a special parent-child relationship, and adding divs in the middle makes it hard to keep the desired layout while extracting logical components.This only has a real benefit on very large and/or deep trees, but application performance often suffers from death by a thousand cuts. Itâs a tiny bit faster and has less memory usage (no need to create an extra DOM node).So are fragments worth using instead of say a wrapper div?Äan Abramov answered this question on StackOverflow: It would probably look something like this.Ä®nter fullscreen mode Exit fullscreen mode ![]() In most cases the wrapper div is âirrelevantâ 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 havenât started to use them yet and the number one reason for this usually is that they have heard of them but havenât got around to learn about them. This behavior results in useless additional markup and also makes the DOM tree heavy with additional layers of divs.React Fragments were introduced in React 16.2.0. ![]() ![]() ![]()
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