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Library/Mobile/Flutter
Easy#flutter

Type promotion trong Dart là gì và khi nào nó không hoạt động?

February 15, 2026

Quick summary

Type promotion is a mechanism where the Dart compiler automatically upgrades a variable to a more specific type (e.g., `String?` to `String`) after passing conditional checks. This process relies on Control Flow Analysis and only applies when the compiler can guarantee the variable won't be mutated after the check.

Sample answer:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam.

Quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore.

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