pattern ini berguna jika kita ingin mengcopy object dari class yang sudah ada

// @noErrors
// @filename: prototype.ts
export class Car {
  public merk: string
  public color: string

  constructor(merk: string, color: string) {
    this.merk = merk
    this.color = color
  }

  clone(): this {
    const clone = Object.assign({}, this)
    return clone
  }
}

// @noErrors
// @filename: index.ts
import { Car } from '$lib/pattern/prototype'

const car1 = new Car('Honda brio', 'white')
const car2 = car1.clone()
car2.color = 'red'

console.log('car 1 =', car1) // car 1 = Car { merk: 'Honda brio', color: 'white' }
console.log('car 2 =', car2) // car 2 = { merk: 'Honda brio', color: 'red' }

dari contoh diatas, pada car2 kita mengcopy data object milik car1. lalu mengubah nilai property colornya.