Determine the number of elements in an array that are equivalent to the Boolean value of

Question

Determine the number of elements in an array that are equivalent to the Boolean value of

After going through several discussions on this topic, I seem to be struggling with the concept. I have an array of objects with different properties and values. My goal is to count a specific property in the array only if its value is true.

In the JSON data provided below, I am required to iterate over each object in the array and tally only those where "IsPartyEnabled" is set to true. In this case, the count would be 3 as per the given JSON. The end result should return the value "3" to my view.

FunToBeHad [{
    "IsFunAllowed": true,
    "IsPartyEnabled": true,
    "IsJoyRefillable": true,
},{
    "IsFunAllowed": true,
    "IsPartyEnabled": false,
    "IsJoyRefillable": true,
},{
    "IsFunAllowed": true,
    "IsPartyEnabled": true,
    "IsJoyRefillable": true,
},{
    "IsFunAllowed": true,
    "IsPartyEnabled": true,
    "IsJoyRefillable": true,
}]

I attempted a solution but hit a roadblock since I suspect the property may remain undefined resulting in no success.

$scope.partyEnabled = function () {

    for (var i = 0; i < $scope.FunToBeHad.length; ++i) {
       if($scope.FunToBeHad[i].IsPartyEnabled = true ) {
           return i;
       }
    }
};

javascript arrays angularjs json

Answer 1

Answer №1

To improve your code, avoid using = for assignment and use == for comparison instead. Also, consider keeping track of the count rather than returning the first index:

$scope.partyCheck = function () {

var totalParties = 0;

for (var j = 0; j < $scope.activities.length; ++j) {
   if($scope.activities[j].isPartyIncluded == true ) {
       totalParties++;
   }
}

return totalParties;
};

Answer 2

To improve your code, avoid using = for assignment and use == for comparison instead. Also, consider keeping track of the count rather than returning the first index:

$scope.partyCheck = function () {

var totalParties = 0;

for (var j = 0; j < $scope.activities.length; ++j) {
   if($scope.activities[j].isPartyIncluded == true ) {
       totalParties++;
   }
}

return totalParties;
};

Answer 3

Answer №2

If you were looking to include $filter in your controller, here is another way to accomplish it:

$scope.partyStatus = function() {
    return $filter('filter')($scope.FunToBeHad, {IsPartyEnabled: true}).length;
};

Answer 4

If you were looking to include $filter in your controller, here is another way to accomplish it:

$scope.partyStatus = function() {
    return $filter('filter')($scope.FunToBeHad, {IsPartyEnabled: true}).length;
};

Answer 5

Answer №3

To create a new array with elements that meet certain criteria, you can utilize the filter method in JavaScript. This method filters out elements that do not pass the test specified. After filtering, you can determine the number of items that passed the test by accessing the "length" property of the new array.

For more detailed information: https://developer.mozilla.org/es/docs/Web/JavaScript/Referencia/Objetos_globales/Array/filter

$scope.partyEnabled = function () {
    return $scope.FunToBeHad.filter(function(elem){
        return elem.IsPartyEnabled;
    }).length;
};

Answer 6

To create a new array with elements that meet certain criteria, you can utilize the filter method in JavaScript. This method filters out elements that do not pass the test specified. After filtering, you can determine the number of items that passed the test by accessing the "length" property of the new array.

For more detailed information: https://developer.mozilla.org/es/docs/Web/JavaScript/Referencia/Objetos_globales/Array/filter

$scope.partyEnabled = function () {
    return $scope.FunToBeHad.filter(function(elem){
        return elem.IsPartyEnabled;
    }).length;
};

Answer 7

Answer №4

Several responses have pointed out the misuse of =/==/=== operators in your code. To improve it, I recommend refactoring to enhance reusability:

$scope.calculateOccurrences = function (propertyToCheck, expectedValue) {
    var count = 0;
    for (var i = 0; i < $scope.items.length; ++i) {
       if($scope.items[i][propertyToCheck] === expectedValue) {
           ++count;
       }
    }
    return count;
};

To use this function, you can do the following:

var total = $scope.calculateOccurrences('isActivated', true);

Answer 8

Several responses have pointed out the misuse of =/==/=== operators in your code. To improve it, I recommend refactoring to enhance reusability:

$scope.calculateOccurrences = function (propertyToCheck, expectedValue) {
    var count = 0;
    for (var i = 0; i < $scope.items.length; ++i) {
       if($scope.items[i][propertyToCheck] === expectedValue) {
           ++count;
       }
    }
    return count;
};

To use this function, you can do the following:

var total = $scope.calculateOccurrences('isActivated', true);

Determine the number of elements in an array that are equivalent to the Boolean value of

Answer №1

Answer №2

Answer №3

Answer №4

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