I want to be able to instantiate objects in javascript (typescript) from a reference to the class. For instance, I want to be able to use some kind of factory function like so, but I don't know how to achieve this result.
class A {
constructor() { this.b = 'somevalue'; }
}
const factory = (klass: Function) => {
return new klass();
}
const instanceOfA = factory(A);
This example is rather contrived, but is there a way of doing this? The current error says klass is not a constructor
. Alternatively if there's a more idiomatic way of instantiating things from a class reference, I'd love to hear it. Thanks!
Function
is just the wrong type, use a constructor type (which also helps infering the correct return type):
function factory<T>(klass: { new(): T }): T {
return new klass();
}
Or as a const
you assign to:
const factory = <T>(klass: { new(): T }) => {
return new klass();
};
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.