prototype-concept.ts

interface IProtoType {
    // interface with clone method
    clone(): this
    // The clone is deep or shallow.
    // It is up to you how you want to implement
    // the details in your concrete class
}

class MyClass implements IProtoType {
    // A Concrete Class
    field: number[]

    constructor(field: number[]) {
        this.field = field // any value of any type
    }

    clone() {
        return Object.assign({}, this) // shallow copy
        // return JSON.parse(JSON.stringify(this)); //deep copy
    }
}

// The Client
const OBJECT1 = new MyClass([1, 2, 3, 4]) // Create an object containing an array
console.log(`OBJECT1: ${JSON.stringify(OBJECT1)}`)

const OBJECT2 = OBJECT1.clone() // Clone
console.log(`OBJECT2: ${JSON.stringify(OBJECT2)}`)
// Change the value of one of the array elements in OBJECT2
// Depending on your clone method, either a shallow or deep copy was performed
OBJECT2.field[1] = 101

// Comparing OBJECT1 and OBJECT2
console.log(`OBJECT2: ${JSON.stringify(OBJECT2)}`)
console.log(`OBJECT1: ${JSON.stringify(OBJECT1)}`)