Whenever I attempt something similar to this
interface MyInterface {
myStringProperty: string = 'str';
myNumberProperty?: number = 9;
myMethodProperty(): void
}
An issue arises in the form of an error like: Error image
After reading through this post ()
What is the best way for me to resolve this?
Did the author of this article even bother to test their code in a playground before writing it? The official 4.0.2 playground can't handle it (Check out the Playground here).
It's pretty clear that it wasn't going to work, as interfaces are not meant for defining actual values. They serve as blueprints for objects, aiding in type validation but not altering or adding fields to implemented objects.
Before proceeding, it is crucial to review the official documentation: https://www.typescriptlang.org/docs/handbook/interfaces.html
In order to incorporate default values, a class must be created to implement the specified interface:
interface DeviceInterface {
modelNumber: string;
}
class Device implements DeviceInterface {
modelNumber: string = "X123";
constructor(brand: string, color: string) { }
}
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