Скачать или смотреть Converting Hexadecimal to Decimal in JavaScript

Learn how to easily convert hexadecimal values into decimal using JavaScript with simple examples and clear explanations.
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This video is based on the question https://stackoverflow.com/q/63459716/ asked by the user 'BlackHaikal' ( https://stackoverflow.com/u/14122133/ ) and on the answer https://stackoverflow.com/a/63459887/ provided by the user 'Ryan1729' ( https://stackoverflow.com/u/4496839/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Converting Hexadecimal to Decimal in JavaScript: A Step-by-Step Guide

Hexadecimal numbers often appear in programming and technology discussions. While working with JavaScript, you might find the need to convert hexadecimal values into decimal format. This process can be straightforward, but ensuring that you do it correctly is crucial, especially when multiple conversions are involved.

The Problem

Imagine you have a string that includes hexadecimal numbers, like:

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

You want to replace 0x5A and 0x83 with their decimal equivalents, 90 and 131, respectively. But how do you achieve this?

If you're facing issues with conversions in your JavaScript code, don’t worry! Let’s break down the solution.

The Solution

To effectively convert hexadecimal values to decimal, we can use the parseInt function available in JavaScript. Here’s how we can structure our solution:

Step-by-Step Breakdown

Retrieve the Text Input:
You’ll need to obtain the string that contains the hexadecimal values you want to convert.

Identify Hexadecimal Values:
Using regular expressions, you can match all hexadecimal numbers in the string.

Convert Hexadecimal to Decimal:
Loop through each matched hexadecimal value and convert it to a decimal using parseInt.

Replace the Original Values with Decimal:
Replace the hexadecimal values in the original string with their corresponding decimal values.

The Updated Code

Here’s a sample code snippet that puts this plan into action:

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

HTML Structure

This JavaScript function can be integrated into an HTML structure like this:

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

Explanation of the Code

Regular Expression: /0[xX][0-9a-fA-F]+ /g - This regex matches hexadecimal numbers that start with 0x or 0X followed by any combination of digits (0-9) and letters (A-F).

Loop & Conversion: For each hexadecimal found, we convert it to decimal using parseInt(fhex[i], 16).

Replacing Values: We replace the original hexadecimal string in code with the decimal number acquired.

Conclusion

Converting hexadecimal numbers to decimal in JavaScript can be accomplished with a few steps. By using regular expressions to find the hexadecimal values and parseInt for conversion, you can quickly perform these transformations.

Next time you encounter a string with hexadecimal values, put this method to work and simplify your coding challenges!