Flutter Interview Questions and Answers | CodeSolution - Where Learn and Share Questions and Answers

A Key is an identifier for Widgets, Elements and SemanticsNodes.
A new widget will only be used to update an existing element if its key is the same as the key of the current widget associated with the element.
Keys must be unique amongst the Elements with the same parent.
Subclasses of Key should either subclass LocalKey or GlobalKey.
Keys are useful when manipulating collections of widgets of the same type.
If you find yourself adding, removing, or reordering a collection of widgets of the same type that hold some state, then, you should use a key.

Latest update: Sep 16th, 2021