Curried Function Sample

curried_func.ts

interface Todo {
  id: number,
  text: string,
  done: boolean
}

const todo: Todo = {
  id: 1,
  text: 'learn TS',
  done: false
}

const prop =
  <T extends string>(key: T) =>
    <U extends { [P in T]: U[T] }>(value: U) =>
      value[key]

const getID = prop('id')
const id = getID(todo)

Source: https://egghead.io/lessons/typescript-query-properties-with-keyof-and-lookup-types-in-typescript