Diff

In this medium-level challenge, you'll implement the Diff<O, O1> type, that returns an object with the difference between two objects.

// Video Solution: https://youtube.com/watch?v=vur6pK1VIDk

/* _____________ Your Code Here _____________ */

type Diff<O, O1> = any

/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '../helpers'

type Foo = {
  name: string
  age: string
}
type Bar = {
  name: string
  age: string
  gender: number
}
type Coo = {
  name: string
  gender: number
}

type cases = [
  Expect<Equal<Diff<Foo, Bar>, { gender: number }>>,
  Expect<Equal<Diff<Bar, Foo>, { gender: number }>>,
  Expect<Equal<Diff<Foo, Coo>, { age: string; gender: number }>>,
  Expect<Equal<Diff<Coo, Foo>, {

Detailed Explanation

[object Object]

How it works:

• keyof (O | O1) creates a union of all keys that are in BOTH objects O and O1
• O & O1 creates an intersection of the objects giving us a new object with all keys that are in at least ONE object
• With this we can use Omit to remove all keys that are in both objects (keyof (O | O1)) from the intersection of the objects (O & O1), giving us the difference between the two objects.

This challenge helps you understand TypeScript's advanced type system and how to apply this concept in real-world scenarios.