How Dart Handles Null: A Deep Dive into the Null Type and Safety

Dart treats null as a unique object — the sole instance of the built-in final class Null — instantiated once during program initialization. Unlike most languages where developers focus primarily on errors and exceptions, Dart dedicates significant documentation to null safety, reflecting its complexity. The Null class exposes only two public attributes, hashCode and runtimeType, and two methods, noSuchMethod() and toString(). Null-related errors can be evaluated at compile time, which aids static analysis and helps developers catch issues early. The language provides operators like the null assertion operator to handle nullable variables, but misuse can still raise runtime exceptions.