Question 1

What is null safety in Dart?

Accepted Answer

Sound null safety means the compiler distinguishes nullable (`String?`) from non-nullable (`String`) types and guarantees, at compile time, that a non-nullable variable can never hold null.

Question 2

What does the late keyword do in Dart, and what's a common mistake with it?

Accepted Answer

late tells the compiler a non-nullable variable will definitely be assigned before use, even though it can't verify that at compile time — deferring the null-safety check to runtime, where accessing it before assignment throws a LateInitializationError.

null-safety Flutter Interview Questions

What is null safety in Dart?

What does the late keyword do in Dart, and what's a common mistake with it?