This is pretty interesting how you can convert not just standard decimal or hexadecimal numbers but any number with a base between 2 and 32. Here’s how:
var myDecimalNum = 10;
myDecimalNum.toString(16);
// result : a
var myHexNum = "a";
parseInt(myHexNum,16);
// result : 10
And not just base 16 (hex), you can do it for any base. Try different bases and have fun.