CODEWITHSUNDEEP
typescript
bharathp
bharathp

Reputation: 395

Creating a typescript class implementing an interface

I would like to implement an interface, but I am having hard time getting the syntax right.

Interface I would like to implement

interface Test {
  [name : string] : (source : string) => void;
}

If I understood this right, the interface is basically an object with strings as keys and functions as values.

Any help is much appreciated.

Edit : I get several errors, "incorrect implementation of interface", "index signature is missing", etc,

Playground example : Link

I did not implement the interface, it is from a sdk

Upvotes: 0

Views: 1032

Answers (2)

basarat
basarat

Reputation: 276199

Just add the index signature to the class: 

interface Test {
    [name: string]: (source: string) => void;

}

class TestClass implements Test {
    [name: string]: (source: string) => void; // Add this
    getLastName(source: string) {
        console.log("test"); 
    }
}

Upvotes: 1

known-as-bmf
known-as-bmf

Reputation: 1222

I don't think a class can implement an interface such as this one.

This is more of a "typed object" interface.

You can type an object to specify that it should have a string as keys and a function taking a string and returning nothing as values.

Like so:

let myObj: Test = {
    test: (source: string) => { console.log('function returning void'); }
};

Upvotes: 0

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