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Performance •
Writing performant components •
Known Issues
Fast & performant React Native list. No more blank cells.
Swap from FlatList in seconds. Get instant performance.
Add the package to your project via yarn add @shopify/flash-list and run pod install in the ios directory.
We recommend reading the detailed documentation for using FlashList here.
But if you are familiar with FlatList, you already know how to use FlashList. You can try out FlashList by changing the component name and adding the estimatedItemSize prop or refer to the example below:
import React from "react";
import { View, Text } from "react-native";
import { FlashList } from "@shopify/flash-list";
const DATA = [
{
title: "First Item",
},
{
title: "Second Item",
},
];
const MyList = () => {
return (
<FlashList
data={DATA}
renderItem={({ item }) => <Text>{item.title}</Text>}
estimatedItemSize={200}
/>
);
};To avoid common pitfalls, you can also follow these steps for migrating from FlatList, based on our own experiences:
- Switch from
FlatListtoFlashListand render the list once. You should see a warning about missingestimatedItemSizeand a suggestion. Set this value as the prop directly. - Important: Scan your
renderItemhierarchy for explicitkeyprop definitions and remove them. If you’re doing a.map()use indices as keys. - Check your
renderItemhierarchy for components that make use ofuseStateand verify whether that state would need to be reset if a different item is passed to that component (see Recycling) - If your list has heterogenous views, pass their types to
FlashListusinggetItemTypeprop to improve performance. - Do not test performance with JS dev mode on. Make sure you’re in release mode.
FlashListcan appear slower while in dev mode due to a small render buffer.
The fixture is an example app showing how to use the library.
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