How to Merge Arrays in JavaScript with matching properties: A Step-By-Step Guide

Discover a simple method to `merge arrays in JavaScript` based on matching IDs. This guide walks you through the process with clear examples.
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Merging Arrays in JavaScript

Combining data from multiple arrays can be a common task in JavaScript programming, especially when synchronizing information from different sources. One common problem developers face is how to merge two arrays based on matching properties. In this guide, we’ll walk through how to merge data arrays based on a corresponding ID.

The Problem

Imagine you have two arrays: a data array that contains names and identifiers, and a goalsData array that has detailed information associated with those identifiers. Your goal is to combine these arrays into a single array that includes all relevant information.

Here’s what your arrays look like:

Data Array

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

Goals Data Array

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

The Solution

To achieve this merge, we will examine both arrays and match the _id from goalsData with the goalsTable from the data array. If a match is found, we will add the relevant details from goalsData into the corresponding data object.

Step 1: Setup Your Arrays

Before diving into the merging logic, make sure your arrays are properly set up:

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

Step 2: Use Nested map Functions

To merge these arrays, we will utilize nested map functions. This allows us to loop through both arrays effectively. Here's how to implement it:

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

Step 3: Result Verification

After executing the merging logic, you can log the modified arr to see the merged result:

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

Conclusion

You now have a merged array that includes both the names and detailed information from the goalsData array based on matching identifiers. The resulting structure will look like this:

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

Final Thoughts

Merging arrays in JavaScript is simple when you understand how to loop through them and compare their properties. By using methods like map effectively, you can streamline data manipulation in your projects, saving you time and reducing complexity. Happy coding!