How to Count Array Items in Angular JS?

A well−liked JavaScript framework for creating dynamic web apps is AngularJS. It offers a variety of helpful array−related tools, such as ways to measure the number of items in an array. In this article, we'll look into using AngularJS to count the number of items in an array.

Method 1: Using the length property

Using the built−in length property is the quickest and most popular method to count the number of items in an array in AngularJS. The length property gives the array's total amount of items.

Algorithm

• Start

• Define an array 'myArray' and assign it to a variable '$scope.myArray'.

• Get the length of the 'myArray' using the length property and assign it to a variable '$scope.arrayLength'.

• Output the '$scope.arrayLength' variable to the console using the console.log method.

• End.

Example

Here's an illustration:

$scope.myArray = [1, 2, 3, 4, 5];
$scope.arrayLength = $scope.myArray.length;
console.log($scope.arrayLength);

We declare an array named myArray and initialize it with 5 items in the code above. The number of items in the array is then counted using the length property, and the result is assigned to a variable named arrayLength. Finally, we output 5 when we record the value of arrayLength to the console.

Method 2: Using the Filter Method

Utilizing the filter function in AngularJS is an additional method for counting the number of items in an array. The filter method in AngularJS is a potent tool for manipulating arrays and can be used to tally the number of items in an array that satisfy a given set of requirements.

Algorithm

• Start

• Define an array 'myArray' and assign it to a variable '$scope.myArray'.

• Filter the 'myArray' using the filter method and assign the filtered array to a variable '$scope.filteredArray'. The filter condition is "item > 2".

• Get the length of the 'filteredArray' using the length property and assign it to a variable '$scope.filteredArrayLength'.

• Output the '$scope.filteredArrayLength' variable to the console using the console.log method.

• End.

Example

Here's an illustration:

$scope.myArray = [1, 2, 3, 4, 5];
$scope.filteredArray = $scope.myArray.filter(item => item > 2);
$scope.filteredArrayLength = $scope.filteredArray.length;
console.log($scope.filteredArrayLength);

We declare an array named myArray and initialize it with 5 items in the code above. Then, we create a new array called filteredArray using the filter method, which only includes the items in myArray that are larger than 2. The number of items in the filtered array is then counted using the length property, and the result is assigned to a variable named filteredArrayLength. Finally, we send 3 to the console after logging the value of the filteredArrayLength.

Method−3: Using the forEach Method

Another helpful AngularJS tool for dealing with arrays is the forEach method. It can be used to repeatedly loop through the array's items and take some action on each one. The forEach function can be used in this situation to count the number of items in the array.

Algorithm

• Start

• Define an array 'myArray' and assign it to a variable '$scope.myArray'.

• Initialize a variable 'arrayLength' with a value of 0 and assign it to a variable '$scope.arrayLength'.

• Iterate through each element in the 'myArray' using the forEach method and pass a callback function with no parameters:

• a. Increment the 'arrayLength' variable by 1.

• After iterating through all elements, output the '$scope.arrayLength' variable to the console using the console.log method.

• End.

Example

Here is an instance:

$scope.myArray = [1, 2, 3, 4, 5];
$scope.arrayLength = 0;
$scope.myArray.forEach(() => $scope.arrayLength++);
console.log($scope.arrayLength);

We declare an array named myArray and initialize it with 5 items in the code above. Next, we define the variable arrayLength and initialize it to 0. We iterate through each item in myArray using the forEach function, increasing arrayLength by 1 for each item as we go. Finally, we output 5 when we record the value of arrayLength to the console.

Conclusion

A frequent job in the development of AngularJS is counting the number of items in an array. The length attribute, the filter method, and the forEach method are a few options for how to do this. The best technique to use depends on your specific use case because each of these approaches has benefits and drawbacks of its own.