What are composables and how are they used in frameworks other than Vue?

What are composables and how are they used in frameworks other than Vue?

Composables are functions that allow you to encapsulate and reuse stateful logic in your applications. While they are a core concept in Vue 3, other frameworks like React and Svelte have similar patterns. For instance, React uses hooks to manage state and side effects, while Svelte has stores for reactive state management.

Can you give me an example of a composable in React?

Sure! In React, a common composable is the useState hook. It allows you to add state to functional components. Here's a simple example:

import React, { useState } from 'react';

function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>Click me</button>
    </div>
  );
}

What about Svelte? How do composables work there?

In Svelte, you can create reactive stores that act as composables. For example, you can create a writable store like this:

import { writable } from 'svelte/store';

export const count = writable(0);

You can then use this store in your components to manage state reactively.

Are there any performance considerations when using composables?

Yes, performance can vary based on how composables are implemented. It's important to avoid unnecessary re-renders and to manage dependencies carefully. In frameworks like React, using useMemo and useCallback can help optimize performance.