Exploring the World of TypeScript: Unraveling the Conund

Question

Exploring the World of TypeScript: Unraveling the Conund

Attempting to familiarize myself with TypeScript.

Confused as to why I am still encountering the error below.

Note: I have made sure to fulfill all interface requirements

interface Greet {
    greet(name?: Greet): string;
    (val: string): string;
}


class Person implements Greet {

    greet(name?: Greet): string {
        return 'Hello ' + name;
    }

    obj(val: string):string {
        return 'Hello';
    };


}

Issue

TsFiles/OopsTest.ts(8,7): error TS2420: Class 'Person' incorrectly implements interface 'Greet'.
  Type 'Person' provides no match for the signature '(val: string): string'
8:26:50 PM - Compilation complete. Watching for file changes.

javascript angular typescript

Answer 1

Answer №1

If you're attempting to construct a hybrid type, the recommended approach according to the official documentation is as follows:

function createPerson(): Greet {
    let person = <Greet>function(msg: string) { return '' };
    person.greet = function(name?: Greet) { return '' };
    return person;
}

The presence of (msg: string): string; within the interface specifies that the implementation of Greet should be a function, rather than a class.

Answer 2

If you're attempting to construct a hybrid type, the recommended approach according to the official documentation is as follows:

function createPerson(): Greet {
    let person = <Greet>function(msg: string) { return '' };
    person.greet = function(name?: Greet) { return '' };
    return person;
}

The presence of (msg: string): string; within the interface specifies that the implementation of Greet should be a function, rather than a class.

Answer 3

Answer №2

abstract class Greeting {
    sayHello(person?: Greeting): string;
    object(value: string): string; // <<<=== `object` instead of `obj`
}

Answer 4

abstract class Greeting {
    sayHello(person?: Greeting): string;
    object(value: string): string; // <<<=== `object` instead of `obj`
}

Exploring the World of TypeScript: Unraveling the Conund

Issue

Answer №1

Answer №2

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