JS: Convert Decimal, Hexadecimal

By Xah Lee. Date: 2012-08-28. Last updated: 2023-10-14.

console.log((15).toString(16).toUpperCase() === "F");

console.log((157).toString(16).toUpperCase() === "9D");

// direct hexadecimal input
// case doesn't matter
console.log(0xff === 255);
console.log(0xFF === 255);

// convert hexadecimal to decimal
console.log(parseInt("ff", 16) === 255);
console.log(parseInt("FF", 16) === 255);