I am working on a web application, and some of the client side logic uses JavaScript to get an integer value from a text box. A user logged a bug claiming that when he entered a value that had a leading 0, for instance 0556, the result was in his words "a random number".

I looked up the parseInt global function here, and lo and behold! parseInt interprets a leading 0 as denoting that an octal number follows! It also has special processing for 0x (hexadecimal). To prevent this interpretation, you can specify the radix yourself in an overload of parseInt, for instance:

parseInt( tb.value, 10 );

For base (radix) 10. 

That's all I have to say about that!