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var SomeClass = Class.create({
  initialize: function( index ){ this.index = index; },
  someCondition: function(){ return this.index % 2; }
});

var SomeClassManager = {
  initialize: function(){
    this.objects = $A();
    $R(0, 10).each(function(index){
      this.objects.push(new SomeClass(index));
    }.bind(this));
  },
  trim: function(){
    this.objects = this.objects.reject(function(item){
      if (item.someCondition()) return true;
    }.bind(this));
  }
}

SomeClassManager.initialize();
SomeClassManager.objects.size(); // 11
SomeClassManager.trim();
SomeClassManager.objects.size(); // 6