hello_world.js

function HelloWorld (name) {
	this.name = name;
}

HelloWorld.prototype.sayHello = function() {
	return "Hello there " + this.name;
}

var hi = new HelloWorld("Ethan");
hi.sayHello(); // => "Hello there Ethan"

hello_world.py

class HelloWorld:
  def __init__(self, name):
    self.name = name
  
  def say_hello:
    return "Hello there " + self.name

hi = HelloWorld("Ethan")
hi.say_hello #=> "Hello there Ethan"

hello_world.rb

class HelloWorld
  def initialize(name)
    @name = name
  end
  
  def say_hello
    "Hello there #{@name}"
  end
end

hi = HelloWorld.new("Ethan")
hi.say_hello # => "Hello there Ethan"