useQueue
Add, remove, and clear element from a queue data structure with useQueue.
Install:
npm i @uidotdev/usehooks
Description:
The useQueue hook is a useful tool for managing a queue of elements within a functional component. It allows you to easily add, remove, and clear elements from the queue while maintaining the necessary state updates. The hook returns an object that includes the functions for manipulating the queue (add, remove, and clear), as well as additional properties such as first, last, size, and queue.
Parameters
| Name | Type | Description |
|---|---|---|
| initialValue | array | (Optional) The initial value for the queue. Default is an empty array. |
Return Value
The useQueue hook returns an object with the following properties and methods:
| Name | Type | Description |
|---|---|---|
| add | function | Adds an element to the end of the queue. |
| remove | function | Removes and returns the first element from the queue. |
| clear | function | Clears the queue, removing all elements. |
| first | any | The first element in the queue. |
| last | any | The last element in the queue. |
| size | number | The number of elements in the queue. |
| queue | array | The current array representing the queue. |
Demo:
Example:
import * as React from "react";
import { useQueue } from "@uidotdev/usehooks";
function QueueDemo({ first, last, size, queue }) {
return (
<figure>
<article>
<p>Front</p>
<ul>
{queue.map((item, i) => {
const isFirst = first === item;
const isLast = last === item;
if (isFirst) {
return <li key={i}>First: {item}</li>;
}
if (isLast) {
return <li key={i}>Last: {item}</li>;
}
return <li key={i}>Item: {item}</li>;
})}
</ul>
<p>Back</p>
</article>
<figcaption>{size} items in the queue</figcaption>
</figure>
);
}
export default function App() {
const { add, remove, clear, first, last, size, queue } = useQueue([1, 2, 3]);
return (
<div>
<header>
<h1>UseQueue</h1>
<button className="link" onClick={() => add((last || 0) + 1)}>
Add
</button>
<button disabled={size === 0} className="link" onClick={() => remove()}>
Remove
</button>
<button disabled={size === 0} className="link" onClick={() => clear()}>
Clear
</button>
</header>
<QueueDemo queue={queue} size={size} first={first} last={last} />
</div>
);
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