How to Copy Inner Object Properties to the Outer Object

Problem: Moving Inner Object Properties to the Outer Object

In some cases, you may encounter a situation where an object contains its actual data within another object assigned to a specific property. To illustrate this, consider the following example:

let tweet = {
  data: {
    id: 1,
    content: 'test'
  }
}

In this scenario, the tweet object stores the tweet data within the data property. However, there may be a need to move these inner properties to the top level of the object as shown below:

let tweet = {
  id: 1,
  content: 'test'
}

The challenge is to achieve this without manually copying the properties, as doing so can introduce bugs when new properties are added.

Solution: Using Object.assign()

To copy the properties of an inner object to the outer object, you can utilize the Object.assign() method.

Here’s how you can accomplish this:

tweet = Object.assign(tweet, tweet.data);

By using Object.assign(), you can merge the properties from tweet.data into the tweet object. This technique allows for the inner object properties to be copied to the outer object effortlessly.

It’s important to note that Object.assign() modifies the target object directly, so the original tweet object will be updated with the new properties.

Conclusion

By using Object.assign(), you can seamlessly copy the properties of an inner object to the outer object. This technique eliminates the need for manual property copying and helps avoid introducing bugs when new properties are added.

Tags: JavaScript, Object Assign, Copy Object Properties