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Null safety Sound null saftey 에 관해서는 여기. dart.dev/null-safety Sound null safety Information about Dart's upcoming null safety feature dart.dev 핵심은? Null safety principles Dart null safety support is based on the following three core design principles: Non-nullable by default. Unless you explicitly tell Dart that a variable can be null, it’s considered non-nullable. This default was chosen after ..