freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/object-oriented-programming/understand-own-properties/index.md

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title: Understand Own Properties
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# Understand Own Properties

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## Problem Explanation

In the example code given you will see a new array `ownProps[]` intialised followed by a `for...in` statement to loop through the properties of `duck` and then use a `push()` statement to fill in the new array. The same method must be followed for the `canary` object. 

Simply replace the `duck` object in the 'for...in' statement with the `canary`object to pass all test cases.


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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript
let canary = new Bird("Tweety");
let ownProps = [];
// Add your code below this line
for (let property in canary) {
  if (canary.hasOwnProperty(property)) {
    ownProps.push(property);
  }
}
```

</details>