CODEWITHSUNDEEP
genericsdictionarytypescript
Andrei Andreev
Andrei Andreev

Reputation: 773

Dictionary of types in typescript?

i have class hierarchy that looks like this:

interface TypeI {
    getName(): string;
}

class ClassA implements TypeI{
    static name: string = "A"
    getname(){
        return ClassA.name;
    }
}

class ClassB implements TypeI{
    static name: string = "B"
    getname(){
        return ClassB.name;
    }
}

Is it possible to make Dictionary of types that implement TypeI in typescript? Something like this:

var typedDictionary: { [<T extends TypeI>] : T };
typedDictionary[ClassA] = new ClassA();
var a: ClassA = typedDictionary[ClassA];

Upvotes: 2

Views: 1928

Answers (1)

basarat
basarat

Reputation: 276353

Dictionary of types that implement TypeI in typescript?

Keys for objects in javascript can only be a string. If you pass in something that is not a string then toString will be called on it. So no, you cannot have a type T as a key ... only a string.

You could however abstract over it in a class and that is something like this generic Dictionary does: https://github.com/basarat/typescript-collections#a-sample-on-dictionary

Upvotes: 1

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