Flutter Keys: Easy Guide to Widget Control and State

Understanding Flutter Keys: A Simple Guide for Everyone

Every Widget has a key. Keys is an object that is used to identify a widget uniquely in a widget tree and also needs to store a widget state having the same type of data.

In the magical realm of Flutter, every widget is like a unique puzzle piece, and keys are the secret spells that help these pieces find their place in the grand puzzle of your app.
But when you start juggling a bunch of widgets that are twinsies in type and have their own little secrets (aka states), that’s when keys become your best friends.

Good News: 🎉 Remember, in the land of Stateless Widgets, keys are like unicorns 🦄 — rare and often unnecessary.

🔑 Knowing When to Use Keys
Most of the time we don’t na, but if you find yourself adding, removing and reordering a collection of widget of the same type that holds some state.

🔄 Swapping Tiles: A Colorful Puzzle
Here’s where things get interesting. When you swap stateless tiles, Flutter just checks the type. But with stateful tiles, it’s a different ball game. You need to give them keys, like little ID badges, so Flutter knows who’s who when they switch places.

🖼️ Flutter’s Display Decisions
Flutter uses the element tree…