TypeScript Functions

Introduction

Syntax

1/* this types a function */
2function addNumbers(a: number, b: number): number {
3  return a + b;
4}

Key Points

• Define argument types inside the parentheses `(a: number)`.
• Define the return type after the parentheses `(): number`.
• Use `void` if the function does not return anything.
• TypeScript throws an error if you pass the wrong number of arguments.