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How to convert decimal to hex in JavaScript?
For any computer programmer who is working with low-level language or assembly language, it is a fundamental task to convert decimal to hex or hexadecimal. In web development we use colors and to represent them it is a common practice to use hex color codes. In Javascript, it is very easy to convert decimal to hexadecimal because of the built-in functions and methods provided by ECMA. In this article, we will discuss multiple ways to convert decimal to hex in javascript with appropriate examples.
Using toString() method
Using Custom Function
Using the toString() Method
As the name suggests the toString() method is used to convert a number into a string, every object in javascript has the toString() method. This method takes radix as a parameter (Optional).
Syntax
Number.toString( Radix )
Here the radix is under 2 to 36. Where Base 2 is for Binary, 8 for Octal, and 16 for Hexadecimal.
Return Value
This method returns the String as a number of provided radix values.
To convert decimal to Hex we need the following steps −
Apply the toString() method to the number.
Pass 16 as the argument of the toString method.
Example
In this example, we are converting Decimal to Hex using the toString method.
<html>
<body>
<h2>Convert decimal to hex using toString() method</h2>
<p id="input"> Decimal: </p>
<p id="output"> Hex: </p>
<script>
let num = 146541;
document.getElementById("input").innerText += num;
let hex = "";
hex = num.toString(16).toUpperCase();
// Print the values
document.getElementById("output").innerText += hex ;
</script>
</body>
</html>
Using Custom Logic
Although javascript provides built-in methods to convert decimal to hex, we can also implement our custom logic to convert decimal to hex. Here are the steps given below.
Create a variable that contains all hex characters which is “0123456789ABCDEF”
Run a loop until the decimal number is greater than 0.
At each iteration get the remainder of the decimal number by dividing it by 16.
And get the character of the remiander’th position of the hex character and this is how you get the appropriate hex characters.
Concatenate all those hex characters.
And finally, divide the decimal number by 16 at each iteration.
Example
In this example, we are converting decimal to hex by making a custom function.
<html>
<body>
<h2>Convert decimal to hex using custom logic</h2>
<p id="input"> Decimal: </p>
<p id="output"> Hex: </p>
<script>
// Define the decimal number to be converted
let num = 116565;
document.getElementById("input").innerText += num;
// Define the hexadecimal characters used for mapping
let hexChars = "0123456789ABCDEF";
// Define variables for the result and the original number
let result = "";
let temp = num;
// Convert the decimal number to a hexadecimal string
while (num > 0) {
let remainder = num % 16;
result = hexChars[remainder] + result;
num = Math.floor(num / 16);
}
document.getElementById("output").innerText += result ;
</script>
</body>
</html>
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