CODEWITHSUNDEEP
typescript
0xDECAFBAD
0xDECAFBAD

Reputation: 637

Typescript: Function overloading

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 { .... }

Upvotes: 3

Views: 609

Answers (1)

Nitzan Tomer
Nitzan Tomer

Reputation: 164129

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)

Upvotes: 4

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