final and const keywords | Flutter

final and const keywords | Flutter

final

• “final” variables are initialized only once and can’t be reassigned.
• Declaring type boosts performance.
• “final” methods and classes, compilation error.
• “final+const” creates constants.
• There is no “val” keyword in Flutter, the equivalent keyword is “final”.

class Button { 
 final String title;
 const Button({required this.title});
 void push() { }
}

const

• “const” in Flutter declares constant variables evaluated at compile-time.
• Cannot be changed.
• Used with variables and constructors, not classes.
• Improves performance by enabling compiler optimizations.

const int myInt = 42;
const button = Button(title: ‘Hello!!’);
button.push();

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