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Prefer const over final over var

When declaring variables in Dart, prefer const over final over var:

  • const is for hardcoded, compile-time constants
  • final is for read-only variables that are set just once
  • var is for variables that are set more than once

The static analyzer will help you choose wisely. 🙂

Example:

void main() { // compile-time constant const favourite = 'I like pizza with tomatoes'; // read-only variable, set just once final newFavourite = favourite.replaceAll('pizza', 'pasta'); // read/write variable, set more than once var totalSpaces = 0; for (var i = 0; i < newFavourite.length; i++) { final c = newFavourite[i]; if (c == ' ') { totalSpaces++; } print('Counted $totalSpaces spaces'); } }

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