TypeScript Pick

TypeScript Pick is a powerful utility type that allows programmers to create a new type by selecting a subset of properties from an existing type. This can be incredibly useful in situations where you have a large object with many properties, but you only need a few of them.

Syntax

Pick<T, K>

• T: the type from which to pick properties.
• K: the union of property keys to pick.

Example

Let's say we have an interface representing a user object:

interface User {
  id: number;
  name: string;
  email: string;
  age: number;
  isAdmin: boolean;
}

If we only needed to use the id, name, and email properties, we could create a new type using Pick like this:

type UserSummary = Pick<User, 'id' | 'name' | 'email'>;

// Returns: { id: number; name: string; email: string; }

In this case, UserSummary is a new type that only contains the id, name, and email properties from the original User type.

Benefits

• Avoids having to create a new interface or type for a small subset of properties
• Helps avoid mistakes when using large objects with many properties
• Makes code more readable and easier to maintain

Conclusion

TypeScript Pick is a valuable tool for any programmer working with TypeScript. It allows for the creation of new types by selecting a subset of properties from an existing type, making code more readable, easier to maintain, and less prone to mistakes.