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Learn how to combine specific items in an array of objects based on their type while preserving the original order. This concise guide walks you through a simple solution using JavaScript.
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Combining Items in an Array of Objects by Type While Maintaining Order

In the world of programming, dealing with arrays filled with objects is a common scenario. Sometimes, we have to manipulate these arrays in specific ways to achieve our desired output. One such situation arises when we need to combine items in an array of objects based on certain conditions. This article will guide you through how to combine specific items in an array of objects depending on the key-value of each object, while maintaining the original order.

The Problem

You are given an array of objects. Each object has a permanent key called type, and depending on its value, has different additional keys. For instance:

If the type is 'text', a text key is present.

If the type is 'notText', another key attrs is included.

Here's an example of such an array:

[[See Video to Reveal this Text or Code Snippet]]

Your task is to combine consecutive items where the type is 'text' while keeping items with type as 'notText' as separate entries. The expected output would look something like this:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

To tackle this problem, we can use the Array.reduce method in JavaScript, which is a powerful tool for transforming arrays. Here's a structured breakdown of the solution:

1. Initialize the reduce Method

We'll start by calling reduce on the array, initializing it with an empty array.

2. Check the Last Item in the Accumulated Array

Inside the reduce method, check if the last item in the accumulated array (acc) is of type text. Based on its type, we will determine whether to combine it with the current item or add a new object to the array.

3. Conditionally Append Items

If the last item was of type: 'text' and the current item is also of type: 'text', we will append the current text to the last item.

If the current item is type: 'notText' or the last item wasn’t type: 'text', we push the current item to the array as a new entry.

Here's how the code looks:

[[See Video to Reveal this Text or Code Snippet]]

4. Log the Result

Finally, you can log the result to check that your logic works as intended:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code

To see the entire process in action, here is the complete code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Using the Array.reduce method allows you to manipulate arrays in powerful ways, and in this case, it helped us combine items depending on their type without losing the order. Whether you are a beginner or experienced developer, mastering such techniques can greatly enhance your coding efficiency. Happy coding!