How to check the existence of key in an object using AngularJS ?

Given an object containing a (key, value) pair and the task is to check whether a key exists in an object or not using AngularJS. In order to check the existence of a key in an object, we will create an object having properties in the form of a key: value pair. Define a temporary variable that will hold the initial key of an object. Create a function expression that will be utilized to check whether the temporary variable that holds an initial key, exists or not in the given object, by comparing them.

Approach: The approach is to use the in operator to check whether a key exists in an object or not. In the first example, the key "Prop_1" is input and it exists in the object. In the second example, the user can check which key they want to check for existence.

Example 1: In this example, the key "Prop_1" is input and checking whether it exists in the object or not.

Output:

Example 2: In this example, the user will check which key they want to check for existence in the given object.

Output: