Salesforce JavaScript Developer Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The method `hasOwnProperty` is a built-in function in JavaScript that is used to determine whether an object has a specified property as its own (not inherited) property. When you call this method on an object and provide a property name as an argument, it returns `true` if the object contains that property as part of its own structure.

For example, if you have an object defined as follows:

```javascript

let obj = {

name: "Alice",

age: 30

};

```

Using `obj.hasOwnProperty('name')` would return `true` because 'name' is a direct property of `obj`.

The method is very reliable for distinguishing between properties that are directly defined on the object and those that are inherited through the object's prototype chain. This makes it an essential tool in scenarios where you need to check the object’s own properties without interference from its prototype.

Thus, if the property you are checking exists directly on the object, the output is definitively `true`. This leads to the conclusion that the correct response to the question regarding the output of `hasOwnProperty` when checking for a property’s existence is indeed `true`.