Rails spinoffs - Mar 2008 - How to do multiple inheritance with mixins in 1.6?

Could someone show me a code snippet for mixing in mutiple mixins into
a class? Say I have the Vulnerable and Dangerous mixins and I want to
mix it into a Person class. My problem is I can do
var Person = Class.create(Vulnerable, {
  initialize: function() {
    this.health = 100;
    this.dead = false;
  }
});
but how do I mixin Dangerous?
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Well, you''re going to run into trouble if both the classes you are
trying to mixin to you Person class are both implementing the same
method names, but assuming that is not the case you can use
Object.extend to mixin another set of methods when you''re creating the
class. This is pretty crazy and it scares me, but I guess it works...

var Foo = {
  bar: function(){
    console.log("I am the bar method on the Foo object");
  }
};

var Hello = {
  world: function(){
    console.log("I am the world method on the Hello object");
  }
};

var FooHello = Class.create(Foo, Object.extend({
  initialize: function(){
  }
}, Hello));

var myInstance = new FooHello();
myInstance.bar();
myInstance.world();

-justin

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I should follow up that when I said "if both the classes" I really
meant to say objects. I don''t even want to know what happens when you
start mixing together multiple classes into a child class (which all
would have an initialize method) and then try to instantiate a new
hybrid object. Don''t do it.

-justin

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Just pass it before "initialization" object (the one that defines
instance methods and constructor). You could pass as many mixins as
you want this way:

var Vulnerable = {
  getShot: function() {
    this.health -= 20;
  },
}

var Dangerous = {
  shoot: function(other) {
    other.getShot();
  }
}

var Person = Class.create( Vulnerable, Dangerous, {
  initialize: function() {
    this.health = 100;
    this.dead = false;
  }
})

var attacker = new Person;
var victim = new Person;

attacker.shoot(victim);
victim.health; // => 80

attacker.shoot(victim);
victim.health; // => 60

// etc.

Best,
kangax

On Mar 26, 4:15 pm, subramaniam.taru...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
> Could someone show me a code snippet for mixing in mutiple mixins into
> a class? Say I have the Vulnerable and Dangerous mixins and I want to
> mix it into a Person class. My problem is I can do
> var Person = Class.create(Vulnerable, {
>   initialize: function() {
>     this.health = 100;
>     this.dead = false;
>   }});
>
> but how do I mixin Dangerous?
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On Wed, Mar 26, 2008 at 7:16 PM, kangax
<kangax-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>  var Person = Class.create( Vulnerable, Dangerous, ...
Nice! I tried passing an array of modules as the first argument but
didn''t think to try like that. Way nicer.

Guess I should have looked at the source code first. :)

-justin

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