how to access function/class properties javascript [duplicate]

Answer 1

Simply accessing it's properties. Your emperor is an object, which means that you can access properties with . syntax.

function Penguin(name){

   this.name=name;

   this.numLegs=2;

}

var emperor = new Penguin("emperor");

console.log(emperor.name);
console.log(emperor.numLegs);

Answer 2

You can use a simple function :

for (var key in emperor) {
  if (emperor.hasOwnProperty(key)) {
    console.log(key + " -> " + emperor[key]);
  }
}

or write

console.log(emperor.numLegs);
console.log(emperor.name);

Reference: How do I loop through or enumerate a JavaScript object?