How to Clone an Object in JavaScript and Prefix All Values

---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: JS. Clone object but prefix all values

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Cloning an Object and Prefixing Values in JavaScript

In JavaScript programming, working with objects is a common yet fundamental aspect of development. One interesting challenge developers encounter is how to clone an object while also modifying its values in the process. For instance, you might need to take an object containing key-value pairs, clone it, and add a prefix to each of the string values.

In this guide, we will explore a clear and effective solution for this problem, guiding you step-by-step through the process.

The Problem

Imagine you have an object defined as follows:

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

You wish to create a clone of this object, modifying the values by prefixing them with the string "prefix_". The expected outcome is:

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

You might already be familiar with the spread syntax for cloning, like so:

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

However, as you might have noted, this syntax merely duplicates the keys and values from the original object without any modificational capability. To achieve our goal of prefixing the values, we need a more tailored approach.

The Solution

reduce(): This method allows us to accumulate results into a new object. We can define how we want to modify each entry during this process.

Step-by-Step Implementation

Let’s break down the implementation:

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

Explanation of the Code

Line 1: We define our original object A.

Line 3: We start creating a new object B using the reduce method.

Inside reduce:

We take an accumulator acc that starts as an empty object {}.

Note that the value remains unchanged - we are only prefixing the new key associated with it.

Line 7: Finally, we log the new object B to the console to verify our results.

Conclusion

By following the steps above, you can easily clone an object in JavaScript while modifying its values. This technique is useful in various scenarios, such as data transformation or preparing objects for API requests.

Now that you have the know-how, feel free to experiment with your own prefixes or adapt this pattern to suit different use cases in your projects. Happy coding!