A TypeScript default function that is nested within an interface

Question

A TypeScript default function that is nested within an interface

This is functioning correctly

interface test{
    imp():number;
}

However, attempting to implement a function within the interface may pose some challenges.

interface test{
    imp():number{
      // do something if it is not overwritten
    }
}

I am encountering issues with this approach in TypeScript. It is possible that there are reserved words, such as 'default' or similar, which could allow for implementing a function inside an interface without being overwritten if the default behavior is desired.

typescript

Answer 1

Answer №1

Unfortunately, TypeScript Interfaces do not exist in the final JavaScript code at runtime. They are only used during development to enforce type checking.

If you're looking for something that will be available in the generated JavaScript, you may want to consider using classes instead:

class Example{
    method(){return "Hello"}
 }

Answer 2

Unfortunately, TypeScript Interfaces do not exist in the final JavaScript code at runtime. They are only used during development to enforce type checking.

If you're looking for something that will be available in the generated JavaScript, you may want to consider using classes instead:

class Example{
    method(){return "Hello"}
 }

Answer 3

Answer №2

Your requirements will be catered to through the use of abstract classes

abstract class Department {

    constructor(public name: string) {
    }

    printName(): void {
        console.log("Department name: " + this.name);
    }

    abstract printMeeting(): void; // implementation required in derived classes
}

class AccountingDepartment extends Department {

    constructor() {
        super("Accounting and Auditing"); // derived class constructors must call super()
    }

    printMeeting(): void {
        console.log("The Accounting Department meets each Monday at 10am.");
    }

    generateReports(): void {
        console.log("Generating accounting reports...");
    }
}

Source https://www.typescriptlang.org/docs/handbook/classes.html#:~:text=Abstract%20classes%20are%20base%20classes,methods%20within%20an%20abstract%20class.

For further details https://www.typescriptlang.org/docs/handbook/classes.html#:~:text=Abstract%20classes%20are%20base%20classes,methods%20within%20an%20abstract%20class.

Answer 4

Your requirements will be catered to through the use of abstract classes

abstract class Department {

    constructor(public name: string) {
    }

    printName(): void {
        console.log("Department name: " + this.name);
    }

    abstract printMeeting(): void; // implementation required in derived classes
}

class AccountingDepartment extends Department {

    constructor() {
        super("Accounting and Auditing"); // derived class constructors must call super()
    }

    printMeeting(): void {
        console.log("The Accounting Department meets each Monday at 10am.");
    }

    generateReports(): void {
        console.log("Generating accounting reports...");
    }
}

Source https://www.typescriptlang.org/docs/handbook/classes.html#:~:text=Abstract%20classes%20are%20base%20classes,methods%20within%20an%20abstract%20class.

For further details https://www.typescriptlang.org/docs/handbook/classes.html#:~:text=Abstract%20classes%20are%20base%20classes,methods%20within%20an%20abstract%20class.

Answer 5

Answer №3

After digging deeper into Typescript, I stumbled upon an interesting feature where an interface and another class or object can have the same name. For example:

interface test {
    imp(): number
}

class test {
    static imp() { return 123 }
}

class test2 /* extends something */ implements test {
    imp() { return test.imp() }
}

It's a bit unfortunate that TS doesn't provide support for function implementations in interfaces like Kotlin does. This could easily eliminate the need for writing wrapper methods, especially since it could be quite simple to implement at the JavaScript level.

Answer 6

After digging deeper into Typescript, I stumbled upon an interesting feature where an interface and another class or object can have the same name. For example:

interface test {
    imp(): number
}

class test {
    static imp() { return 123 }
}

class test2 /* extends something */ implements test {
    imp() { return test.imp() }
}

It's a bit unfortunate that TS doesn't provide support for function implementations in interfaces like Kotlin does. This could easily eliminate the need for writing wrapper methods, especially since it could be quite simple to implement at the JavaScript level.

A TypeScript default function that is nested within an interface

Answer №1

Answer №2

Answer №3

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