function World() {}
World.prototype.hello = function () { console.log("Hello World") }
function Greeter(name) { this.name = name }
Greeter.prototype.hello = function () { console.log("Hello " + this.name + "!") }
var world = new World()
var greeter = new Greeter("Programowanie Obiektowe")
world.hello()
greeter.hello()
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