function addNumbers(a: number, b: number): number {
  return a + b
}
console.log(addNumbers(3,5))


const fullName = (firstname: string, lastname: string = ""): string => {
  return `${firstname} ${lastname}`
}
console.log(fullName('Dhananjay'))
console.log(fullName('Dhananjay', 'Patel'))