Javascript Constructors

constructors.js

function HelloWorld(str) { 
  this.str = str;

  this.speak = function() {
    console.log("hello", this.str);
  }
};
var h = new HelloWorld("world");
h.speak();
(new HelloWorld("Jupiter")).speak();

function Howdy() {
  this.speak = function (str) {
    this.str = str;
    console.log("howdy", this.str);
  }
}
(new Howdy).speak("Texas");

var Greet = function () {
  this.speak = function (str) {
    this.str = str;
    console.log("hello", this.str);
  }
};
(new Greet).speak("how you doing");

var Gutentag = {
  speak: function (str) {
    this.str = str;
    console.log("gutentag", this.str);
  }
};
Gutentag.speak("mein freund");