define(['ko','underscore'],function(ko,_){'use strict';function iterator(callback,args,elem){callback=elem[callback];if(_.isFunction(callback)){return callback.apply(elem,args);}
return callback;}
function wrapper(method){return function(iteratee){var callback=iteratee,elems=this(),args=_.toArray(arguments);if(_.isString(iteratee)){callback=iterator.bind(null,iteratee,args.slice(1));args.unshift(callback);}
args.unshift(elems);return _[method].apply(_,args);};}
_.extend(ko.observableArray.fn,{each:wrapper('each'),map:wrapper('map'),filter:wrapper('filter'),some:wrapper('some'),every:wrapper('every'),groupBy:wrapper('groupBy'),sortBy:wrapper('sortBy'),findWhere:function(properties){return _.findWhere(this(),properties);},contains:function(value){return _.contains(this(),value);},hasNo:function(){return!this.contains.apply(this,arguments);},getLength:function(){return this().length;},indexBy:function(key){return _.indexBy(this(),key);},without:function(){var args=Array.prototype.slice.call(arguments);args.unshift(this());return _.without.apply(_,args);},first:function(){return _.first(this());},last:function(){return _.last(this());},pluck:function(){var args=Array.prototype.slice.call(arguments);args.unshift(this());return _.pluck.apply(_,args);}});});