Dart's Sound Null Safety: No More Null Errors
In Dart, variables can't be null unless you explicitly allow it. This flips the usual model, turning potential runtime null pointer crashes into compile-time errors you can fix immediately.
Dart's sound null safety guarantees that a variable cannot be null unless you opt-in by adding a `?` to its type. This "non-nullable by default" principle eliminates runtime null pointer exceptions by catching them as analysis errors during development, forcing you to handle potential nulls before your code runs. The common footgun is overusing nullable types (`?`) out of habit, which undermines the safety guarantees, or forgetting to use them for data that can genuinely be absent, like from an API response.
Read the original → dart.dev
- #dart
- #flutter
- #null safety
- #type system
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