Knockout.js custom foreach binding that filters objects that have been destroyed. (The rule can be customized or possibly passed in)

filter_destroyed.js.coffee

ko.bindingHandlers.filterDestroyed =
  init: (element, valueAccessor, allBindings, viewModel, bindingContext) ->
    filteredValueAccessor = ->
      observableArray = valueAccessor()
      _.filter observableArray(), (viewModel) ->
        viewModel._destroy() is false

    ko.bindingHandlers["template"]["init"] element, ko.bindingHandlers["foreach"].makeTemplateValueAccessor(filteredValueAccessor)

  update: (element, valueAccessor, allBindings, viewModel, bindingContext) ->
    filteredValueAccessor = ->
      observableArray = valueAccessor()
      _.filter observableArray(), (viewModel) ->
        viewModel._destroy() is false

    ko.bindingHandlers["template"]["update"] element, ko.bindingHandlers["foreach"].makeTemplateValueAccessor(filteredValueAccessor), allBindings, viewModel, bindingContext

ko.virtualElements.allowedBindings.filterDestroyed = true