exclude-properties-02.ts

interface Person {
  firstName: string;
  lastName: string;
  email: string;
  phone: string;
}

type PersonWithoutEmail = Omit<Person, "email">
type PersonWithoutEmailOrPhone = Omit<Person, "email" | "phone">

const person: Person = {
  firstName: "Jane",
  lastName: "Bloggs",
  email: "jane@example.com",
  phone: "0123456789"
};

const omitKey = <T, K extends keyof T>(data: T, key: K) => {
  const { [key]: _, ...o } = data;
  return o;
}

const omitKeys = <T, K extends keyof T>(data: T, keys: K[]): Omit<T, K> => {
  return keys.reduce((curr, key) =>
    (keys.includes(key) ? curr : { ...curr, [key]: data[key] })
    , {} as Omit<T, K>)
}

console.log(person);

const personWithoutEmail: PersonWithoutEmail = omitKey(person, "email")
console.log(personWithoutEmail)

const safePerson: PersonWithoutEmailOrPhone = omitKeys(person, ["email", "phone"])
console.log(safePerson)