Practising TS generics

tsGenerics.ts

// create a function which takes an array of any types, and return a value of that type

// create a function which takes 2 values of any type and return an array of the type

// create a function called 'makeFullName', which takes an object 

// create a function called 'makeFullName', which takes an object with attribute { firstName, lastName }

// making it optional 
interface UserName {
  firstName: string
  lastName: string
  fullName?: string
}

// not sure how to make this work 
const makeFullName = (obj: UserName): (obj: UserName) => {
  return {
    ...obj,
    fullName: obj.firstName + " " + obj.lastName
  }
}

const yc = makeFullName({firstName: 'yap', lastName: 'yowchun'})
console.log(yc)