Lära Static Properties and Methods


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class MathHelper {
  static pi: number = 3.14159;

  static calculateCircleArea(radius: number): number {
    return MathHelper.pi * radius * radius;
  }
}

// Accessing static members without creating an instance
console.log(MathHelper.pi); // 3.14159
console.log(MathHelper.calculateCircleArea(5)); // 78.53975

When working with classes in TypeScript, you will encounter both static and instance members. Static members belong to the class itself, not to any specific object created from that class. You access static properties and methods using the class name, not through an instance. For example, MathHelper.pi and MathHelper.calculateCircleArea() are both accessed directly from the class.

In contrast, instance members are tied to individual objects created from the class. You must create an instance with new before you can access these members.

Use static members when you need functionality or data that is shared by all instances of a class, or when the data does not depend on instance-specific information. Common examples include:

Utility methods;
Constants;
Counters that are relevant to the class as a whole.

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Avsnitt 1. Kapitel 5

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              1234567891011
            
class MathHelper {
  static pi: number = 3.14159;

  static calculateCircleArea(radius: number): number {
    return MathHelper.pi * radius * radius;
  }
}

// Accessing static members without creating an instance
console.log(MathHelper.pi); // 3.14159
console.log(MathHelper.calculateCircleArea(5)); // 78.53975

In contrast, instance members are tied to individual objects created from the class. You must create an instance with new before you can access these members.

Use static members when you need functionality or data that is shared by all instances of a class, or when the data does not depend on instance-specific information. Common examples include:

Utility methods;
Constants;
Counters that are relevant to the class as a whole.

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 5