They are not necessarily required, though, to wrap our JSX. If div containers are used for anything like adding styles to the JSX, then there is no issue. While this is fine, it may, however, cause unintended issues in our components. As a result, we employ Fragments that were added in React 16.2 instead of the unnecessary 'div' element. It makes the execution of code faster as compared to the div tag.Īs demonstrated in the code in the above section, in order to render more than one root element, the entire content must be contained within the 'div' tag, which is disliked by many developers. So basically, The main reason to use the Fragments tag is: We are avoiding having 45 nodes shown in the DOM, thanks to it! A very sophisticated application requiring numerous DOM nodes will gain greatly in terms of performance from this. It keeps 45 nodes from being rendered in the DOM for us! In a very complicated application with several requirements, this provides tremendous performance gains. Although this may not seem like much, the added benefit of preserving more nodes also grows as the depth of the tree increases. As a result, we are saving an extra 14 nodes (45 minus 31). In contrast, prior versions added an extra node every time we had to use div as a wrapper, which resulted in an additional 2 d − 1 − 2 2^ -2) = 45 2 d − 1 + ( 2 d − 1 − 2 ) = 4 5 nodes in older versions of React. To represent this structure in a conventional application, we just need to be worried about 2 d − 2 2^d - 2 2 d − 2 nodes being present in the DOM. The number of nodes in the DOM Tree at a particular depth is 2 d − 1 2^d -1 2 d − 1. Take a look at the example below, where there are just two children for each React element: The addition of this extra node to the DOM might occasionally cause your HTML output to be formatted incorrectly, and many developers dislike it.īecause each node in React's tree-like structure represents an element or component, employing a div to surround a group of elements adds a new node, deepening the DOM Tree. However, the render function will require a 'div' tag and place the entire content or elements inside it if you wish to return several elements. Only one root node inside it will ever be rendered at a time via the rendering technique. A single element or a collection of elements may be returned by this render method. In React, you must call a render method inside the component whenever you wish to display something on the screen. Small React applications are not greatly impacted by this, but working on a real-world project with many nested layers of children can significantly impact the application's response time. The syntax known as fragments enables us to add several components to a React component without having to add an additional DOM node for each one. The Fragments API is useful in this situation. This practice causes a number of issues, including the rendering of ineffective markup and occasionally even invalid HTML, which is frequently problematic. Due to the fact that React components can only return one element at a time, the wrapper div is frequently "irrelevant" and is only used in this circumstance. When we were required to return several elements, they had to be contained within a single div prior to the release of React version 16.2. Any component of yours with multiple children would always need a wrapper because React lacked the tools to avoid this, therefore an additional DOM node is necessary. Before React v16, we had to enclose our elements in a div anytime we wanted to return a collection of components or elements. React is a strong library that makes use of previously created components and reuses them as needed.
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