What's the difference between final and const?

Summary

Both are single-assignment. final values may be computed at runtime; const values are compile-time constants and const collections/objects are deeply immutable and canonicalised.

Longer Answer

In Flutter, const widgets can be reused without rebuilding, which helps performance.

Key Points

• final: runtime, once.
• const: compile time, deeply immutable.
• const objects are canonicalised.

Deep dive: Dart Fundamentals: Variables