Transform Object Values to Shorter Format in JavaScript

Discover how to efficiently convert all values of an object in an array to their last two digits in JavaScript, making data handling easier and cleaner.
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Transform Object Values to Shorter Format in JavaScript

When working with data structures in JavaScript, especially objects and arrays, you may find yourself needing to manipulate values for various reasons. A common scenario arises when you want to shorten numerical values by extracting only the last two digits. In this post, we will explore how to achieve this efficiently within an array of objects.

The Problem

Imagine you have an array of objects resembling the following structure:

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

Your goal is to transform this data to only include the last two digits of each number, resulting in:

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

If you are unsure about the best way to implement this transformation in JavaScript, follow along for a step-by-step solution.

The Solution

We will use the map function in JavaScript, which creates a new array with the results of calling a provided function on every element in the calling array. Here’s how you can achieve the desired transformation:

Step-by-Step Guide

Clone the Original Object: It’s important to avoid mutating the original data. We'll create a clone of the object using the spread operator ({...item}).

Iterate through the Object's Keys: Use a for...in loop to access each key in the object.

Extract and Transform Values: For each key, we will:

Convert the number to a string.

Use the slice method to get the last two characters.

Convert this substring back to an integer.

Return the Newly Formed Object: After modifying the values, return the cloned object.

Here’s the Code

Here’s the complete code snippet that implements the above steps:

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

Explanation of the Code

map Function: Processes each object in the array, allowing us to apply our transformation logic.

parseInt and slice: These JavaScript methods are crucial in extracting the last two digits. slice(-2) retrieves the last two characters from the string representation of the number.

Handling Large Numbers: This method works for any number, no matter how large, as long as it’s a valid integer.

By following the steps outlined in this guide, you should now be able to transform object values in an array easily! This technique is not only efficient but also maintains data integrity by cloning the original objects.

Conclusion

Manipulating object values in arrays can seem daunting, but with JavaScript’s powerful array methods, it becomes manageable and straightforward. Remember the process: map, clone, iterate, and transform, and you’ll be equipped to handle similar situations in the future. Happy coding!