Impara Static Methods in Classes | Advanced Class Features

When working with classes in JavaScript, you may sometimes need to group utility functions or operations that are related to the class itself, rather than to any particular instance. This is where the static keyword comes into play. A static method is defined on the class itself, not on its instances. You call a static method directly from the class, rather than from an object created by the class.

Static methods are useful for actions that do not depend on instance data. For example, you might use a static method for calculations, conversions, or factory methods that help create or configure instances. Unlike instance methods, which are called on objects created by the class, static methods cannot access instance properties or use this to refer to an instance. Instead, this inside a static method refers to the class itself.

You should use static methods when:

The method does not need to access or modify instance-specific data;
The method performs a utility or helper operation related to the class;
You want to organize related functionality under the class name without requiring object instantiation.

Static methods help keep your code organized and clarify which methods operate at the class level versus those that operate on individual objects.


              123456789101112
            
class MathHelper {
  static add(a, b) {
    return a + b;
  }
}

// Call the static method directly on the class
console.log(MathHelper.add(5, 3)); // Output: 8

// The following would cause an error, since add is not an instance method:
// const helper = new MathHelper();
// helper.add(5, 3); // TypeError: helper.add is not a function

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Sezione 3. Capitolo 1

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You should use static methods when:

The method does not need to access or modify instance-specific data;
The method performs a utility or helper operation related to the class;
You want to organize related functionality under the class name without requiring object instantiation.

Static methods help keep your code organized and clarify which methods operate at the class level versus those that operate on individual objects.


              123456789101112
            
class MathHelper {
  static add(a, b) {
    return a + b;
  }
}

// Call the static method directly on the class
console.log(MathHelper.add(5, 3)); // Output: 8

// The following would cause an error, since add is not an instance method:
// const helper = new MathHelper();
// helper.add(5, 3); // TypeError: helper.add is not a function

Tutto è chiaro?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 1