Javascript inheritance example, using Object.create(), ctors, and super method calls

js-inheritance

/* refs:
 * http://oli.me.uk/2013/06/01/prototypical-inheritance-done-right/
 * http://davidshariff.com/blog/javascript-inheritance-patterns/
 */
"use strict";

function Human(name, gender) {
    this.name = name;
    this.gender = gender;
}

Human.prototype = {
    name : '',
    gender : '',
    planetOfBirth : 'Earth',
    sayGender : function() {
        console.log(this.name + ' says my gender is ' + this.gender);
    },
    sayPlanet : function() {
        console.log(this.name + ' was born on ' + this.planetOfBirth);
    }
};

function Martian(name, gender) {
    Human.call(this, name, gender)
};

Martian.prototype = Object.create(Human.prototype, {
    constructor : {
        value : Martian
    },
    planetOfBirth : {
        value : "Mars"
    },
    sayPlanet: {
        value: function() {
            Human.prototype.sayPlanet.call(this);
            console.log((this.gender === "male"? "He" : "She") + " is a Martian");
        }
    }
});

var marvin = new Martian("Marvin", "male");

var jane = new Human("Jane", "female");
jane.sayGender();
jane.sayPlanet();
console.log()
var marsha = new Martian("Marsha", "female");
marsha.sayGender();
marsha.sayPlanet();
console.log()
marvin.sayGender();
marvin.sayPlanet();