Programming with prototypes cheatsheet

Creating objects

var Foo = {
    init(id) {
        this.type = 'foo';
        this.setId(id);
    },
  
    setId(id) { this.id = id; },
    getId() { return this.id; },
};
var baz = Object.create(Foo);
baz.init(10);

Inheritance

var Foo = {
    setId(id) { this.id = id; },
    getId() { return this.id; },
};
var Bar = Object.create(Foo);
Bar.setName = function(name) {
   this.name = name;
};
Bar.getName = function() {
   return this.name;
}
var baz = Object.create(Bar);

Polymorphism

var Foo = {
    init(id) {
        this.type = 'foo';
        this.setId(id);
    },
};
var Bar = Object.create(Foo);
Bar.init = function(id, name) {
   this.type = 'bar';
   this.id = id;
   this.name = name;
}
var baz = Object.create(Bar);
baz.init(10, 'test');

Immutability

var Foo = { };
Object.defineProperty(Foo, ‘type’, {
   value : ‘FOO’,
   writeable : false,
   configurable : false,
   enumerable : true,
});

Static functions

var Foo = {
    addition : 5,
    add(param) {
        return param + this.addition;
    },
};
var baz = Object.create(Foo);
var result = Foo.add(3);

More information about all these patterns can be found here.