在angular.js控制器中过滤和计数数组

Question

I have an array of objects in my Angular app and each has a "ready" field, which is a timestamp. I want to count the number of objects where the ready timestamp is earlier than the current time. How would I do this?

I have:

$scope.getDatetime = new Date();
$scope.numberReady = $filter('filter')($scope.array, {ready <  $scope.getDatetime}).length;

Obviously I can't use ready < $scope.getDatetime , but that, logically speaking, is what I want to do.

Answer 1

You can use pure ES5 filter method, no need of Angular here:

$scope.getDatetime = new Date();
$scope.numberReady = $scope.array.filter(function(obj) {
    return obj.ready < $scope.getDatetime;
}).length;

... although you could use Angular filter here too:

$scope.getDatetime = new Date();
$scope.numberReady = $filter('filter')($scope.array, function(obj) {
    return obj.ready <  $scope.getDatetime;
}).length;

but since it's just a wrapper around native thing, this is not ideal in this case.