Typescript: Utilizing function overloading

Is there a straightforward approach to implementing 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 { .... }

Answer №1

For detailed information on function overloads, you can refer to the Overloads section of the Functions documentation. In your specific scenario, the function setup would look something 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) {
        // Handle logic for first signature
    } else if (args.length === 4) {
        // Handle logic for second signature
    } else {
        // Display error for unknown signature
    }
}

(To see this code in action and play around with it, visit the code in the playground)

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