_.each and _.find in underscore.js

_.each is for looping and _.find returns the first match:

function dropExtraneousViews(viewsToKeep) {
   var temporaryViews = new Array();
   _.each(app.views, function(name,view) {
      if (view.indexOf(tempMoniker) == 0) {
         temporaryViews.push(view);
      }
   });
   _.each(temporaryViews, function(view) {
      var match = _.find(viewsToKeep, function(keeper) {
         return keeper == view;
      });
      if (match == undefined) {
         delete app.views[view];
      }
   });
}