Comparing and constrasting Dart's const and final keywords

dart-final-const.md

Use the const keyword when you want to create a compile-time constant.
Note that this value will be immutable.

const color = 'Lava Orange';
color = 'Mexico Blue';  // Error: cannot reassign a const

const colors = ['Lava Orange'];
colors.add('Lava Orange');  // Error: unsupported operation

Use the final keyword when you want to create a readonly variablae. run-time constant. Note that you may change properties of the value being pointed to, but you can't change the pointer.

final color = 'Lava Orange';
color = 'Mexico Blue';  // Error: cannot reasign a final

const colors = ['Lava Orange'];
colors.add('Mexico Blue');  // [Lava Orange, Mexico Blue]