function ViewModel() {
      var self = this;
      this.items = ko.observableArray([]);
      this.addItems1 = function(items) {
        [].push.apply(self.items(), items);
        self.items.valueHasMutated();
      };
    
      this.addItems2 = function (items) {
          self.items.push.apply(self.items, items);
      };
    }
    
    function Item(text) {
      this.text = ko.observable(text);
    }
    
    var vm = new ViewModel();
    ko.applyBindings(vm);

Teardown JS


    vm.items([]);

Test cases

Test #1

Title *

Async

Code *

var i = 0;
var items = [];

for (i = 0; i < 2000; i++) {
  items.push(new Item("Item" + i));
}
vm.addItems1(items);

Test #2

Title *

Async

Code *

var i = 0;
var items = [];

for (i = 0; i < 2000; i++) {
  items.push(new Item("Item" + i));
}
vm.addItems2(items);

Test case details

Preparation Code

Test cases

Test #1

Test #2