Do you need to extract specific properties from a JavaScript object? Object slicing allows you to create a new object with only the properties you need. In this tutorial, we'll explore how to slice an object in JavaScript.
To slice an object, you can use the Object.fromEntries() method along with Object.entries() and Array.prototype.filter() to create a new object with the desired properties. Here's an example of how to slice an object to include only certain properties:
```javascript
const sourceObject = {
name: 'John',
age: 30,
email: 'john@example.com',
address: '123 Street'
};
const selectedProperties = ['name', 'email'];
const slicedObject = Object.fromEntries(
Object.entries(sourceObject)
.filter(([key]) => selectedProperties.includes(key))
);
console.log(slicedObject);
// Output: { name: 'John', email: 'john@example.com' }
```
In the example above, we have a sourceObject with name, age, email, and address properties. We then define selectedProperties as an array containing the names of the properties we want to include in the sliced object. We use Object.entries() to convert the sourceObject into an array of key-value pairs, and then use Array.prototype.filter() to keep only the entries where the key is included in the selectedProperties array. Finally, we use Object.fromEntries() to convert the filtered array back into an object.
If you want to exclude specific properties from the source object, you can modify the filtering condition inside the filter() method. For example, to exclude the 'address' property, you can change the condition to:
```javascript
.filter(([key]) => !excludedProperties.includes(key))
```
Where excludedProperties is an array containing the names of the properties to exclude.
Keep in mind that object slicing creates a new object and does not modify the original source object. This means that you can safely slice an object without affecting the original data.
In summary, object slicing in JavaScript allows you to easily create a new object with selected properties from a source object. By using Object.fromEntries() along with Object.entries() and Array.prototype.filter(), you can efficiently slice an object to include or exclude specific properties.
Now that you've learned how to slice an object in JavaScript, you can leverage this technique to manipulate and extract data from objects in your applications effectively.
