MaterialMaterialPageRoute bulider

[ahmedrabeasmaha]

MaterialPageRoute(
    builder: (context) => ScanQR(),
)

i want to know why i can't type ScanQR() or ScanQR(context) and why to use () =>

[navaronbracke]

The builder requires a function that takes a BuildContext and returns a Widget.

Passing in ScanQR() would return just Widget. This is not what the builder wants as Widget != (BuildContext) => Widget.