Or is there a pattern in TypeScript that you just can't achieve without abstract properties? I've tried creating one but failed so far. I can see how it saves you several lines of code but personally I don't mind the Java like getters and setters, I'm primarily interested in patterns you just can't currently implement with TypeScript. TypeScript is the one of the tools people want to learn most, according to a Stack Overflow Survey of 90,000 developers. TypeScript has exploded in popularity, community size, and adoption over the past few years.
- Abstract Classes. Abstract classes are base classes from which other classes may be derived. They may not be instantiated directly. Unlike an interface, an abstract class may contain implementation details for its members. The abstract keyword is used to define abstract classes as well as abstract methods within an abstract class.
- Nov 18, 2016 // Abstract base class abstract class MyBaseClass // Abstract properties to be set in subclass // Use getter syntax protected abstract get string1: string. One Reply to “Setting Subclass Properties in TypeScript” Tiffany says: January 6, 2020 at 5:24 am.
![Property Property](https://image.slidesharecdn.com/typescriptdnugpbv2-160425181135/95/typescript-21-638.jpg?cb=1494269221)
ES6 includes static members and so does TypeScript. The static members of a class are accessed using the class name and dot notation, without creating an object e.g. <ClassName>.<StaticMember>.
The static members can be defined by using the keyword static. Consider the following example of a class with static property.
The above
Circle
class includes a static property pi
. This can be accessed using Circle.pi
. TypeScript will generate the following JavaScript code for the above Circle
class.
Typescript Class Example
The following example defines a class with static property and method and how to access it.
The above
Circle
class includes a static property and a static method. Inside the static method calculateArea
, the static property can be accessed using this keyword or using the class name Circle.pi
.
Now, consider the following example with static and non-static members.
Typescript Abstract Property
As you can see, static and non-static fields with the same name can exists without any error. The static field will be accessed using dot notation and the non-static field can be accessed using an object.
Let's see another example.
In the above example, the
Circle
class includes static method calculateArea
and non-static method calculateCircumference
. As you can see, the static field pi
can be accessed in the static method using this.pi
and in the non-static (instance) method using Circle.pi
.
Typescript Abstract Readonly Property
The class or constructor cannot be static in TypeScript.