ES5 code, without classes

es5-no-classes-impl.js

/* ES5 code, without classes */
var Civilian = function Civilian(name) {
    this.name = name;
};
Civilian.prototype.danger = function () { console.log("Run away!"); };
 
var SuperHero = function(name, ability) {
    Civilian.call(this, name); // Call the super class constructor.
    this.ability = ability;
};
SuperHero.prototype = Object.create(Civilian.prototype);
SuperHero.prototype.constructor = SuperHero;
SuperHero.prototype.danger = function () { // Override the super class method.
    console.log("Never fear, " + this.name + " is here!");
    console.log(this.name + " uses " + this.ability + ". It's super effective.");
};
 

Why var Civilian = function Civilian(name) {? Just var Civilian = function (name) { is enough, or more simply, function Civilian(name) {.