class Shape {
    constructor(
        public lineCount: number, 
        public name: string) {}

    public toString(): string {
        return `${this.name}, ` + 
            `lineCount is ${this.lineCount}`
    }
}

let square = new Shape(4, "Square")
// Copy without methods
let clone1 = { ...square }
// Clone sees changes to original
let clone2 = Object.create(square)

square.lineCount = 5
square.name = "Red sqare"

console.log(square.toString())
console.log(clone1.toString())
console.log("clone1.lineCount is", 
    clone1.lineCount)
console.log(clone2.toString())