TypeScript

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Overloading

Function overloading is a technique used to define multiple function signatures with the same name and different parameter lists. This allows for more flexible and expressive APIs, as the function can accept different arguments and return different values depending on the signature that is invoked.

To define function overloads in TypeScript, you use the function keyword followed by the name of the function and a set of parentheses containing the parameter types for the first signature. Then, you define additional signatures using the function keyword followed by the same function name and parentheses containing the parameter types for each subsequent signature. The function body for each signature is not included in the definition.

1. function add(a: number, b: number): number; function add(a: string, b: string): string; function add(a: any, b: any): any { return a + b; }
3. console.log(add(1, 2)); // Output: 3 console.log(add('hello', 'world')); // Output: helloworld

Note that the implementation signature, which has a parameter type of any, is not used for type checking. It is only used as the implementation for the other signatures.