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A static getter in Dart is a class-level accessor method defined using the static and get keywords. It allows read-only access to a computed or encapsulated value directly through the class identifier, rather than through an instantiated object. Because it is bound to the class’s namespace and executes in a static context, a static getter cannot access instance members or the this reference.

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Syntax

A static getter is declared inside a class using the static modifier followed by the return type, the get keyword, and the identifier. It can be written using either a block body or an arrow (=>) expression. 
class ClassName {
  // Block body syntax
  static ReturnType get propertyName {
    return expression;
  }

  // Arrow syntax
  static ReturnType get otherPropertyName => expression;
}

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Technical Characteristics

  • Invocation: Static getters are invoked directly on the class name without parentheses. The syntax is identical to accessing a static variable (ClassName.propertyName).
  • Scope Restrictions: The execution context of a static getter is strictly limited to the class level. Attempting to reference this or any non-static variables/methods within the getter’s body will result in a compile-time error.
  • Accessing Internal State: Static getters are frequently used to expose private static variables (denoted by a leading underscore _).
  • Read-Only Nature: Defining a static getter without a corresponding static setter makes the property read-only to the caller. The underlying value can only be mutated if the class provides a separate mechanism to modify the internal static state.

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Code Example

class Configuration {
  // Private static variable
  static String _environment = 'development';

  // Static getter exposing the private variable
  static String get environment => _environment;

  // Static getter computing a value
  static bool get isProduction {
    return _environment == 'production';
  }
}

void main() {
  // Invoked on the class itself, no parentheses required
  print(Configuration.environment); 
  print(Configuration.isProduction); 
}
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