[Typescript] Using 'Pick' to create a sub-type from original type

There might be cases where you have selective data for your entities. Let's say that you are building a public API endpoint to get all the registered users from your 

users

 collection. Now there might be sensitive data in your 

User

 entity type that you may not want to return in the response. In such cases, 

Pick

 can help you be selective and get only the properties you need.

In this lesson, we will learn how to extract properties from a type and create a new type from it.

interface Item {
  name: string;
  description: string;
  price: number;
  currency: string;
  image: string;
};

type ItemPreview = Pick<Item, "name" | "image">;

const item: Item = {
  name: "Macbook",
  description: "Macbook Pro 2019",
  price: 2138,
  currency: "USD",
  image: "https://cdn.apple.com/mbpro.png"
};

const itemPreview: ItemPreview = {
  name: item.name,
  image: item.image,
  description: item.description
};

console.log(itemPreview);
console.log(item);