Object Properties 하고 싶어요.

TL;DR

export function pickInstance<K>(instance: K, ...pickProperties: (keyof K)[]): Pick<K, typeof pickProperties[number]> {
  return <Pick<K, typeof pickProperties[number]>>pickProperties.reduce<Partial<K>>((i, p) => {
    i[p] = instance[p]
    return i
  }, {})
}

export function ommitInstance<K>(instance: K, ...omitProperties: (keyof K)[]): Omit<K, typeof omitProperties[number]> {
  return <Omit<K, typeof omitProperties[number]>>omitProperties.reduce<Partial<K>>((i, p) => {
    delete i[p]
    return i
  }, Object.assign({}, instance))
}

왜 흑마술을 해요?