Created
July 7, 2021 15:58
-
-
Save creotip/335a18787555242950c40f25746acf39 to your computer and use it in GitHub Desktop.
React: Prevent re-rendering of a list, while removing an item
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import React, { useState, useCallback } from "react"; | |
const todos = [ | |
{ | |
name: "TODO Task No.0", | |
id: 8598554 | |
}, | |
{ | |
name: "TODO Task No.1", | |
id: 189730 | |
}, | |
{ | |
name: "TODO Task No.2", | |
id: 609396 | |
}, | |
{ | |
name: "TODO Task No.3", | |
id: 1927856 | |
}, | |
{ | |
name: "TODO Task No.4", | |
id: 4070713 | |
} | |
]; | |
const Item = React.memo(({ id, name, handleDelete }) => { | |
console.log("Render Item: ", id); | |
return ( | |
<div | |
onClick={() => handleDelete(id)} | |
title="Click to delete" | |
style={{ padding: "1rem", border: "1px solid", cursor: "pointer" }} | |
> | |
<div> | |
<div>{name}</div> | |
<div>ID: {id}</div> | |
</div> | |
</div> | |
); | |
}); | |
const App = () => { | |
const [newItems, setNewItems] = useState(todos); | |
const handleDelete = useCallback((id) => { | |
setNewItems((newItems) => newItems.filter((item) => item.id !== id)); | |
}, []); | |
return ( | |
<div className="appList"> | |
{newItems.map((item, i) => ( | |
<Item key={item.id} {...item} handleDelete={handleDelete} /> | |
))} | |
</div> | |
); | |
}; | |
export default App; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment