2023-05-23
3211
#react native
Hussain Arif
62541
May 23, 2023 ⋅ 11 min read

A deep dive into React Native FlatList

Hussain Arif Hussain is a CS student in Pakistan whose biggest interest is learning and teaching programming to make the world a better place.

Recent posts:

the replay october 8

The Replay (10/8/25): Data enrichment, CSS is back, TypeScript 5.9

Discover what’s new in The Replay, LogRocket’s newsletter for dev and engineering leaders, in the October 8th issue.

Matt MacCormack
Oct 8, 2025 ⋅ 30 sec read
Goodbye, messy data: An engineer’s guide to scalable data enrichment

Goodbye, messy data: An engineer’s guide to scalable data enrichment

Walk through building a data enrichment workflow that moves beyond simple lead gen to become a powerful internal tool for enterprises.

Alexandra Spalato
Oct 8, 2025 ⋅ 6 min read

DesignCoder and the future of AI-generated UI

From sketches to code in minutes, DesignCoder shows how AI-generated, hierarchy-aware UIs could change the way developers prototype and ship apps.

Rosario De Chiara
Oct 7, 2025 ⋅ 5 min read

Should you use if() functions in CSS?

It’s 2025, and CSS finally thinks logically. The if() function brings real conditional styling — no hacks, no JS workarounds. Here’s how to use it right.

Ikeh Akinyemi
Oct 7, 2025 ⋅ 16 min read
View all posts

7 Replies to "A deep dive into React Native <code>FlatList</code>"

    1. Anonymous functions for the ‘keyExtractor’ prop are alright. This is because they don’t get re-rendered repeatedly, so there’s no performance costs

  1. Certainly everything but a deep dive.. you just showed an example of usage. As for FlatList, the most buggy component in all React Native, I highly recommend you not to talk about FlatList as a “rock solid” component. I was excepting a deep dive into the component itself and how to avoid at least the rendering issues, the images not loading within the FlatList items etc.. just a very beginner’s guide, which is great for beginners, but change the title, it’s totally misleading.

    1. Hi Vahradrim, thank you for taking the time to read my post! I didn’t research properly and that’s my fault.
      I’ve now updated my article and would like to know your thoughts.

  2. Hi, what if the array that im showing is extracted from firebase and I don’t know what is the key value pair of the object, how do we use FlatList as the above examples it is known the keys of each key-value pair?

  3. Hey, thanks for the article. Here is another interesting issue with flat list.
    I have a View, containing flatlist inside a react-navigation tab bar.
    Everything works fine, but when I add a button before flatlist, like this

    ..
    ..

    the last element in the flatlist seems to be hidden behind the tab bar.
    Trying to figure out what is wrong.
    So would be interesting to read about best practises, like don’t use other elements except flatlist on a screen etc.

Leave a Reply