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Abstract Class Methods

Learn about abstract class methods, their definition and implementation in derived classes, and practical applications.

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Abstract class methods in TypeScript

An abstract class method is similar to an abstract class in that it is designed to be overridden. In other words, declaring a class method as abstract means that a derived class must provide an implementation of this method. For this reason, abstract class methods are not allowed to provide a function implementation.

As an example of this, let’s update the EmployeeBase class:

TypeScript 4.9.5
// Define an abstract class EmployeeBase with the following properties and methods:
// - `id` property of type number
// - `name` property of type string
// - `doWork` method with no return type (abstract method)
// - constructor that initializes `id` and `name` properties with `id` and `name` arguments
abstract class EmployeeBase {
  public id: number;
  public name: string;
  // Abstract method with no implementation, to be overridden by derived classes
  abstract doWork(): void;
  constructor(id: number, name: string) {
    this.id = id;
    this.name = name;
  }
}
Abstract class defining methods and properties

Here, we have added a class method named ...