Скачать или смотреть How to Sort an Array of Numbers by Decimal in JavaScript

Learn how to sort an array of numbers with decimal values in JavaScript, ensuring proper numeric order for effective data handling.
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How to Sort an Array of Numbers by Decimal in JavaScript

Sorting arrays can sometimes seem trivial, but when dealing with decimal numbers, it can be quite tricky. If you've ever found yourself frustrated by unnecessary sorting order in a numeric array, you're not alone! This guide will guide you through a common issue when sorting decimals and show you how to achieve the desired order in JavaScript.

The Problem

Let's consider the following array of numbers:

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

When you sort this array using the typical JavaScript sort() method, the result will not meet expectations. For example, you might find that 9.1 is placed before 9.2, when what you really want is for the array to maintain a correct decimal sequence, resulting in:

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

So, how do we enforce this order based on decimal values? The key lies in treating the numbers as strings, allowing us to split and compare the integer and fractional parts effectively.

The Solution

The method to achieve this is through a custom sorting function. Below, we’ll break down the steps and provide a code snippet that demonstrates how to sort the array correctly.

Step 1: Convert the Numbers to Strings

To ensure accurate sorting based on both whole and decimal parts, convert each number to a string. This allows for easier manipulation and comparison of the numeric components.

Step 2: Split the Strings into Parts

By using the split() method, each string representing a number can be divided into two parts: the integer part and the decimal part. This way, comparisons can be made correctly.

Step 3: Compare the Parts

When comparing two elements, we first check their integer parts and then their decimal parts. If the integer parts are the same, we will look at the decimal parts for accurate ordering.

The Code

Here's a complete JavaScript snippet that implements the above logic:

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

Explanation of the Code

Array Declaration: We define our array of numeric strings.

Sorting Function: We use the sort() method with a custom comparison function.

We split each number string into an array partsA and partsB.

First, we compare the integer parts (before the decimal).

If they’re the same, we then compare the decimal parts (after the decimal).

We handle cases where there are no decimal values (setting them to 0 for comparison).

Conclusion

Sorting an array of numbers with decimal values may initially pose challenges in JavaScript. However, by utilizing string manipulation and custom sorting functions, we can efficiently manage and sort numeric data as intended. Now, when sorting similar arrays, remember to treat numbers as strings for a successful outcome!

Try this approach in your projects and see how much better your number sorting results will be!