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Function Overload ↔ Design Pattern to reuse multiple versions of same function with various Signatures

aka Function-Overloading

Overload Signature​

Function Signature with Type annotations but w/o implementation

Function Signature​

Type Annotation to define function I/O

!alt use union type or optional parameters

Implementation Signature

overload example

function add(x: string, y: string): string;
function add(x: number, y: number): number;
function add(x: any, y: any): any {
  return x + y;
}

which is same as

References​