1337Coder

If anyone is curious about the luhn algorithm, here is one I made in C# from the example in the question:

static bool IsValidLuhn(string numbers) { if (numbers == null) throw new ArgumentNullException("number", "number must have a value.");

var allNumbers = numbers .Where((c) => c >= '0' && c <= '9') .Reverse() .Select((c, i) => (i % 2 == 1) ? ((Convert.ToInt32(c) - 48) * 2).ToString() : c.ToString());

return allNumbers.Count() > 0 ? allNumbers.Aggregate((x, y) => x + y).Sum((c) => Convert.ToInt32(c) - 48) % 10 == 0 : false; }

Edit: Can sum one link me to HackerNews markdown?

For anyone trying to go to the Erik Meijer link, the correct url is: http://channel9.msdn.com/Series/C9-Lectures-Erik-Meijer-Func...

I think vasquez put an extra right angle bracket by mistake.

This is the exact reason I created this: https://privatemsg.matthew-dove.com/

Yes, it is encrypted on the server. That hash is just a key to get your message. Its not the message itself.

Last weekend when the NSA news was a big deal, I was angry, I wanted my privacy back. I use all the standard stuff (like opt-out, Ghostery, etc). Using https for my emails with Google is great, unless they just send my plain text data to the NSA on request. So I looked around for a safe way to email. OMG was it hard. I had to install all kinds of stuff, find out how it works, and alot of them required the receiver of the message to also have said software. Yeah, if its that hard, no thanks. So I made this in one weekend. Alas I didn't have SSL (encryption) on my domain. And it took a week to change servers, get a dedicated IP and install the SSL. Anyway here it is. Create your message, send your friend the link to your message however you normally would, and they (only them) can see the message. No Google saving your data, and once your message has been viewed its deleted. Nothing for the NSA to even ask for. I realise the message creator is geared towards web developers, version two would ideally contain a more friendly text editor.

Well would you believe that it is not uncommon for one or two people to die on a cruise? I went on a 10 day cruise a few years ago and three people died on it. They chucked 'em in the fridge and carried on the trip like it was normal.

I use "&" and "|" when i use enums, that act as options. I.e. var myCarExtras = Extra.Radio | Extra.PowerWindows;

Where Extra = { Radio = 1, PowerWindows = 2, Tint = 4, Rims = 8 };

Then I can do: if (Tint | powerWindows) { return totalPrice + 1000; }

Oh yes you are correct.

In this case the merchant only loses the cost to the vendor ($7,000). Good catch.

sorry for being pedantic, but should'nt it be shouldn't?

You would think so but no. Visa etc and the banks don't want that kind of trouble. To charge cards you need a special bank account called a merchant account.

A condition of this merchant account is that if someone issues a charge-back on their creditcard, if the merchant can't prove that the card owner brought the service/product then the funds are taken directly form their merchant account by the bank and then given back to the card-holder.

This is why anti-fraud systems are so important to merchants.

Case: I steal your creditcard, I buy a tv worth $10, 000. You notice this, and chargeback the merchant. The merchant has to pay you $10, 000 and he lost teh cost price of the tv he sold me (say $7, 000).

So by accepting your stolen card as payment, the merchant just lost $17, 000!

Source: I build payment gateways.

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