Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsDefine a React arrow-function component as a JavaScript arrow function that returns JSX, then render it with JSX such as <Greeting />. For example:
const Greeting = () => <h1>Hello</h1>;
function App() {
return <Greeting />;
}Define and render an arrow-function component
A function component is a JavaScript function that returns the UI React should display. An arrow function is one way to write that function. Use the component in JSX so React can manage its rendering; do not call it directly as Greeting(). See React’s guidance on how React calls components and Hooks.
Component names begin with a capital letter, which distinguishes them from built-in lowercase HTML elements such as div and button.
Return JSX with or without an explicit return
When the component returns one expression, parentheses are optional, and an implicit return keeps the definition concise:
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const Greeting = () => <h1>Hello</h1>;Use braces and return when the function body needs multiple statements:
const Greeting = () => {
const message = 'Hello';
return <h1>{message}</h1>;
};Pass props into the component
React passes props to a function component as its argument. Destructure the values you need, then use them in JSX:
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const Greeting = ({ name }) => {
return <h1>Hello, {name}</h1>;
};
function App() {
return <Greeting name="Mina" />;
}In this example, name="Mina" supplies the name prop, and {name} inserts its value into the heading.
Use Hooks at the top level
An arrow-function component can use Hooks, such as useState, in its function body. Call Hooks at the top level of a function component or custom Hook, before any early return. Do not put them inside conditions, loops, nested functions, or event handlers. React explains these requirements in its Rules of Hooks.
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import { useState } from 'react';
const Counter = () => {
const [count, setCount] = useState(0);
return (
<button onClick={() => setCount(count + 1)}>
{count}
</button>
);
};Here, useState runs at the top level of Counter, and the button’s click handler updates the state. The component then renders the current count.
Pass event handlers instead of calling them during render
An arrow function can define the component, and another arrow function can serve as an event handler. These are separate uses of arrow syntax. An event prop such as onClick should receive a function to run later. Writing onClick={handleSave()} calls the function immediately while rendering, rather than waiting for a click. React shows this distinction in its guide to responding to events.
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Use a named handler for reusable or longer logic
function SaveButton() {
const handleSave = () => {
saveDocument();
};
return <button onClick={handleSave}>Save</button>;
}Passing handleSave gives React the function; it does not run the function during render.
Use an inline arrow for a short one-off action
<button onClick={() => setCount(count + 1)}>Add one</button>Inline handlers are convenient for brief behavior. A named handler can make longer logic clearer and can be reused.
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Arrow functions are optional; function declarations also work
A component can also be written as a function declaration:
function Greeting() {
return <h1>Hello</h1>;
}Both forms define a function component that can be rendered with JSX. React does not require arrow syntax, and the official guidance does not establish that arrow components are inherently faster or universally preferable. React’s Component reference says, “We recommend defining components as functions instead of classes. See how to migrate.” That is a recommendation, not a requirement; class components remain supported.
Keep rendering pure
A component’s render should calculate UI from its inputs rather than perform side effects. Treat props and state as immutable snapshots: do not modify them directly. React’s guidance on component and Hook purity explains these expectations.
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