How to Add Additional Properties to Object Arrays Using JavaScript Map and Object Spread?

Enriching Object Arrays with Additional Properties: Adding "Active" to Each Element

In a real-world programming scenario, you may encounter the need to extend existing object arrays with additional properties. For instance, consider an array of objects representing user data, each containing an "id" and "name." To track their activity status, you want to add an "Active" property to each object.

Using Array.prototype.map() to Augment Objects

One elegant approach to this problem is leveraging the Array.prototype.map() method. This method creates a new array by applying a transformation function to each element of the original array. In our case, we define a function that takes an object and returns a new object with an additional "Active" property set to "false."

<code class="javascript">const updatedResults = Results.map(obj => ({
  ...obj, // Copy existing properties
  Active: 'false' // Add new "Active" property
}));</code>

By applying the map() method, you obtain a new array, "updatedResults," where each object has the desired "Active" property. The original "Results" array remains unchanged.

Understanding the Object Spread Syntax

The "..." syntax in the function is known as object spread syntax. It copies all enumerable properties from one object into another. In this case, we use it to preserve the existing properties ("id" and "name") while adding the new "Active" property.

Output Verification

After executing the above code, you can check the "updatedResults" array to confirm that each object now has the "Active" property set to "false":

<code class="javascript">console.log(updatedResults);
// Output:
// [
//   { id: 1, name: 'Rick', Active: 'false' },
//   { id: 2, name: 'david', Active: 'false' }
// ]</code>

Conclusion

By utilizing Array.prototype.map() and object spread syntax, you can easily enhance arrays of objects with additional properties. This technique is widely applicable in various programming scenarios where you need to extend and manipulate data structures dynamically.

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