How Can I Merge Arrays of Objects Based on a Key Without Iteration in JavaScript?

Merge Arrays of Objects Based on a Key Without Iteration

In programming, it is often necessary to combine data from multiple sources into a single entity. In this specific instance, we have two arrays of objects that need to be merged based on a common key, "id," to obtain the merged result.

The provided JavaScript code snippet efficiently accomplishes this task without resorting to iterative methods like Object.keys(). Here's a breakdown of how it works:

• We first define two arrays, arr1 and arr2, which represent the input arrays of objects.
• The map() function is then applied to arr1. The purpose of map() is to create a new array by applying a specified callback function to each element of the original array.
• Inside the callback function, the syntax Object.assign(destination, ...sources) is used to merge the properties of two objects, the first object being the destination and the second being the source.
• In this case, the destination is an empty object created using {}, and the source is arr2[i], which represents the corresponding object from arr2.
• The result of the map() operation assigns the merged objects into a new array, arr3.
• Finally, the console logs arr3 to display the merged output.

This code efficiently combines the two arrays of objects into a single array, eliminating the need for cumbersome iteration methods. It provides a concise and straightforward approach to merging data based on a common key.

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