What is the best way to compare the lengths of all nested child elements with each other?

Question

What is the best way to compare the lengths of all nested child elements with each other?

I have an object with nested children, like this:

$scope.artists.materials.items[] //contains list of items

Now I need to compare the total length of each artist's list of items. If there is a mismatch in the number of items between artists, I want to return true or false.

For example, if Artist1 has 2 items and Artist2 has only 1 item, it's considered a mismatch as I need both artists to have the same number of items.

However, I'm unsure how to make this comparison using AngularJS.

Code:

 function checkItemsValidity() {
        angular.forEach($scope.artists, function (artist) {
            alert(artist.materials.items.length);
        });
    }

What would be a better approach to achieve this?

javascript angularjs

Answer 1

Answer №1

To ensure all artists have an equal number of items, you can store the length of items from the first artist and verify that all artists match that same items length. Here's a suggestion on how to achieve this:

Enhanced based on feedback received

function checkItemsConsistency() {
    var itemsLength = $scope.artists[0].materials.items.length;
    angular.forEach($scope.artists, function (artist) {
        if(artist.materials.items.length !== itemsLength) {
            return false;
        }
    });
    return true;
}

Answer 2

To ensure all artists have an equal number of items, you can store the length of items from the first artist and verify that all artists match that same items length. Here's a suggestion on how to achieve this:

Enhanced based on feedback received

function checkItemsConsistency() {
    var itemsLength = $scope.artists[0].materials.items.length;
    angular.forEach($scope.artists, function (artist) {
        if(artist.materials.items.length !== itemsLength) {
            return false;
        }
    });
    return true;
}

Answer 3

Answer №2

A suggestion to enhance Lex's solution: eliminate the need for the isValid variable by stopping the loop once a difference is detected.

function checkItemsConsistency() {
  var length = $scope.artists[0].materials.items.length;
  for (var index = 0; index < $scope.artists.length; index++) {
    if ($scope.artists[index].materials.items.length !== length) {
      return false;
    }
  }
  return true;
}

Answer 4

A suggestion to enhance Lex's solution: eliminate the need for the isValid variable by stopping the loop once a difference is detected.

function checkItemsConsistency() {
  var length = $scope.artists[0].materials.items.length;
  for (var index = 0; index < $scope.artists.length; index++) {
    if ($scope.artists[index].materials.items.length !== length) {
      return false;
    }
  }
  return true;
}

What is the best way to compare the lengths of all nested child elements with each other?

Answer №1

Answer №2

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