Typescript: Function overloading

Question

What would be the easiest way to achieve / implement such a function overload in TypeScript?

function Foo(
    param1: number,
    param2: string,
    param3: string,
    param4: () => void,
    param5: (xyz: string) => void): void { .... }

function Foo(
    param6: number,
    param3: string,
    param4: () => void,
    param5: (xyz: string) => void): void { .... }

Nitzan Tomer · Accepted Answer · 2016-07-21 06:15:51Z

4

It's covered in Overloads section of the Functions docs, but in your case it can be like this:

function Foo(
    param1: number,
    param2: string,
    param3: string,
    param4: () => void,
    param5: (xyz: string) => void): void; 
function Foo(
    param6: number,
    param3: string,
    param4: () => void,
    param5: (xyz: string) => void): void;

function Foo(...args: any[]): void {
    if (args.length === 5) {
        // 1st signature
    } else if (args.length === 4) {
        // 2nd signature
    } else {
        // error: unknown signature
    }
}

(code in playground)

edited Jul 21, 2016 at 6:15

answered Jul 20, 2016 at 12:14

Nitzan Tomer

166k51 gold badges330 silver badges307 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Typescript: Function overloading

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related