In React, a unique key is used to determine which of the components in a collection needs to be re-rendered. regular JS commenting to JSX. I'm still on a hunt for a for a fix to get the comment Same goes for multiline comments: You can't just use HTML comments inside of JSX because it You can't just use HTML comments inside of JSX because the compiler will think that they are real DOM Nodes. Calling the render() method multiple times may serve our purpose for this example, but in general it is never used, instead a stateful component is used which we will cover in further articles. If you use Sublime Text, I've created a little snippet so you Each parent comment has an array of Given that data, we want to stack the comments with the parent on top and their children below them like you see on Reddit or Hacker News.And each child comment should be nested inside its parent with some Here's a function that will recursively render each parent comment and its children:This is a function we would place inside a React component and have it render each parent comment that is stored in our data.It takes a parent comment object for a parameter and It may help to open the developer tools in your browser and check out how the comments are rendered in the For your reference, here is the full code for what we did in this article:The code above has everything combined into one file:To keep this article short, the code only shows you how to render comments in a way that is recursive and nested, but there's a lot you can add on to this in terms of styling and functionality.For example, comments sections usually display the username of the person who made the comment and have a way for you to upvote or downvote comments. Your code needs to be able to dynamically handle the variable number of both parent and children comments.First, let's figure out what the data would look like that we would be working with.This is some data for a fake article with the title The comments are an array of objects, all of which are parent comments. A React Element is almost never used isolately, we can use elements as the building blocks of creating a component in React. The Comment() function then returns a
element with the parent comment and all of its children (also
elements) stacked inside of it via the {nestedComments} line of code. Recursion is a programming technique that has a lot of useful applications when building software. How do you comment in JSX? Point to remember, while adding comment in react application: 1. Function and Class components both have some additional features that we will discuss in the next sections. Try adding more parent and children comments to the data and see how it renders on the page.You should now have a good understanding of recursion and how it can be used in a React application by building the skeleton of a comments section.Have any questions or comments about this article? If anyone is a interesting in working on this (and getElementById ( 'root' ) … add something? We focus on anything that helps our readers become better software developers. name} ;}} The above two components are equivalent from React’s point of view. render ( element , document . props. from scratch. To use the function, we need to place the Comment function directly into a React component that we export to either render as a page or be used in another page. For multi-line comment, you can use below syntax : {/* Multi line comment */}3. React chama o componente Welcome com {name: 'Sara'} como props. You'll need to use JavaScript comments inside of You Comments in JSX are weird and when searching for information, it's hard to find a straightforward answer. In this article, we'll explain the concept of recursion and how you can put it to good use in a As an example, we'll be building a React component that has the data structure of a comments section that displays both parent comments and their children.Before we jump into a React use-case for recursion, it will help to have a good understanding of what recursion is in the realm of computer science.Recursion is a technique for solving a problem where the final solution depends on several solutions to smaller instances of the same problem.