Javascript diamond inheritance structure -

using node looking way around diamond inheritance in javascript:

var util = require('util');  function base(example_value) {   console.log(example_value);   this.example_property = example_value;   this.example_method = function() { ... }; }  function foo(settings) {   var f = settings.f;   base.call(x);   this.settings = settings; }  util.inherits(foo, base);  function bar(settings) {   var b = settings.b;   base.call(b);   this.settings = settings; }  util.inherits(bar, base);  var foo = new foo({f: 'bar'}); // 'bar' gets printed , can call methods base.. foo.example_method(); var bar = new bar({b: 'foo'}); // 'foo' gets printed , can call methods base.. bar.example_method(); 

no problems here..but need make available in foo , bar (and base) in encompassing object:

function top(settings) {   foo.call(this, settings);   bar.call(this, settings); }  util.inherits(top, foo); util.inhertis(top, bar);  var top = new top({some: 'value'}); 

'value' gets printed twice isn't after. doing inheritance isn't best way looking alternatives / suggestions deal diamond shape structure.

p.s. haven't included original code modified simplify - i've done hand, don't think there mistakes point i'm trying across should there.

can use delegation?

function top(settings) {   this.foo = new foo(settings);   this.bar = new bar(settings); }  top.prototype.conflictingmethod = function() {    // use either this.foo or this.bar } top.prototype.anothermethod = function() {    return this.foo.anothermethod(); } 

you use mixins, need add class system. ext-js supports mixins http://www.sencha.com/learn/sencha-class-system

// my/sample/cansing.js ext.define('my.sample.cansing', {     sing: function(songname) {         alert("i'm singing " + songname);     } });  // my/sample/canplayguitar.js ext.define('my.sample.canplayguitar', {     playguitar: function() {         alert("i'm playing guitar");     } });  // my/sample/cancomposesongs.js ext.define('my.sample.cancomposesongs', {     composesongs: function() {         alert("i'm composing songs");          return this;     } });  // my/sample/coolguy.js ext.define('my.sample.coolguy', {     extend: 'my.sample.person',     mixins: {         cansing: 'my.sample.cansing',         canplayguitar: 'my.sample.canplayguitar'     } });  // my/sample/musician.js ext.define('my.sample.musician', {     extend: 'my.sample.person',     mixins: {         cansing: 'my.sample.cansing',         canplayguitar: 'my.sample.canplayguitar',         cancomposesongs: 'my.sample.cancomposesongs'     } });  // app.js var nicolas = new my.sample.coolguy("nicolas"); nicolas.sing("november rain"); // alerts "i'm singing november rain"