How to represent Hexadecimal numbers in JavaScript?

Hexadecimal numbers are represented by a leading 0X or 0x followed by characters 0123456789ABCDEF.

HelloWorld.js

var x = 0xFF;
var y = 0XFF;

console.log("x : " + x);
console.log("y : " + y);

Output

x : 255

y : 255

If the digits after 0x contains characters other than 0123456789ABCDEF, SyntaxError is thrown.

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