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Learning TypeScript 2.x - Second Edition
book

Learning TypeScript 2.x - Second Edition

by Remo H. Jansen
April 2018
Beginner content levelBeginner
536 pages
13h 21m
English
Packt Publishing
Content preview from Learning TypeScript 2.x - Second Edition

Abstract classes

Abstract classes are base classes that can be extended by other classes. The abstract keyword is used to define abstract classes as well as abstract methods within an abstract class:

abstract class Department { 
 
    constructor(public name: string) { 
    } 
 
    public printName(): void { 
        console.log("Department name: " + this.name); 
    } 
 
    public abstract printMeeting(): void; // must be implemented in derived classes 
} 

The methods in an abstract class that are preceded by the abstract keyword cannot contain an implementation and must be implemented by the derived classes.

Abstract methods may look like interface methods. However, an abstract class may contain implementation details for some of its members:

class AccountingDepartment extends ...
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Publisher Resources

ISBN: 9781788391474Supplemental Content