Components, unlike JavaScript functions, must return JSX. useContext React API Reference Hooks useContext useContext is a React Hook that lets you read and subscribe to context from your component.Component names must start with a capital letter (that is, M圜omponent, instead of m圜omponent) React Context provides a way to share data (state) in your app without passing down props on every component.We can organized groups of elements into React components.Ī basic function component is written similarly to a regular JavaScript function with a couple of differences. We can write fragments in a regular or shorthand syntax: or. If we don’t want to wrap our elements in a container element like a div, we can use a fragment: // valid syntax React requires that all returned elements be returned within a single “parent” component.įor example, we can’t return two sibling elements, like an h1 and a paragraph from a component: // this syntax is invalid React also gives us an element called a fragment. Inline styles are not written as plain strings, but as properties on objects: My header To apply inline styles, instead of using double quotes (“”), we use two sets of curly braces. The most common example is the class attribute, which we write as className. Since JSX is really JavaScript and JavaScript uses a camelcase naming convention (that is, “camelCase”), attributes are written differently than HTML. They must end in a forward slash /: Īdditionally, JSX requires a different syntax for its attributes. Unlike HTML, single-tag elements (like the img element), must be self-closing. In a typical React application, data is passed top-down (parent to child) via props, but this can be difficult for certain types of props (e.g. However, because JSX is really just JavaScript functions (and not HTML), the syntax is a bit different. Even if you've never worked with React context before, you're in the right place. In this comprehensive guide, we will cover what React context is, how to use it, when and when not to use context, and lots more. It lets you easily share state in your applications. It enables you to consume the data held in the context through providers and consumers without prop drilling. We write React elements using a feature called JSX. React context is an essential tool for every React developer to know. React Context provides a way to share data (state) in your app without passing down props on every component. You can write any valid HTML element in React. Nhng nó yêu cu bn phi truyn props xung cho các component con. Gii pháp tt nht là bn phi lifting state (y state t component con lên component cha). React elements are written just like regular HTML elements. useContext là gì Chia s state gia các component là bài toán ph bin trong React App. It includes all of the essential information in this article as a convenient PDF guide. ![]() I’ve put together a super helpful cheatsheet to give you a complete overview of all of the React concepts you need to know in 2022.Ĭlick here to download the cheatsheet in PDF format. React context is an essential tool for every React developer to know. Do you want to get up to speed with React as quickly as possible?
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