How to make empty an array using AngularJS ?
Given an array & the task is to make empty an array or delete all the elements from the array in AngularJS. In order to do this, there are 2 ways i.e., either use the [] notation to reinitialize the array which eventually removes all the elements from the array, or set the length of the array to 0 by using length property, which also empty the array.
We will explore both the approaches & understand them through the illustrations.
Approach: In this case. arr =[] will create a new array & assign a reference to it to a variable, while any other reference will remain unaffected that still points to the original array.
Example 1: This example illustrates empty an array using the [] notation in AngularJS.
HTML
<!DOCTYPE html><html><head> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.13/angular.min.js"> </script> <script> var myApp = angular.module("app", []); myApp.controller("controller", function ($scope) { $scope.arr = ['Geek', 'GeeksforGeeks', 'gfg']; $scope.emptyArr = function () { $scope.arr = []; }; }); </script></head><body style="text-align:center;"> <h1 style="color:green;"> GeeksforGeeks </h1> <h3> How to empty an array in AngularJS </h3> <div ng-app="app"> <div ng-controller="controller"> Array = {{arr}}<br><br> <button ng-click='emptyArr()'> Clear Array </button> </div> </div></body></html> |
Output:
Approach: In this case, arr.length = 0 manipulates the array itself, i.e., basically deleting everything from the array & while accessing the array with the help of different variables, then we will get the modified array.
Example 2: This example illustrates setting the array length to 0 using length property, which specifies an empty array.
HTML
<!DOCTYPE html><html><head> <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.13/angular.min.js"> </script> <script> var myApp = angular.module("app", []); myApp.controller("controller", function ($scope) { $scope.arr = ['Geek', 'GeeksforGeeks', 'gfg']; $scope.emptyArr = function () { $scope.arr.length = 0; }; }); </script></head><body style="text-align:center;"> <h1 style="color:green;"> GeeksforGeeks </h1> <h3> How to empty an array in AngularJS </h3> <div ng-app="app"> <div ng-controller="controller"> Array = {{arr}}<br><br> <button ng-click='emptyArr()'> Clear Array </button> </div> </div></body></html> |
Output:
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