TIL Pizza box servers

I was learning about WebSockets today for a college project and decided to build a chat webapp as defined in the homework section of Socket.io's getting started guide.

The result of modulo operator (%) varies between programming languages especially when one of the operand is negative.

While working on an Android app, I had some issues with the SQLite database and wanted to delete it. This db is stored in the app's internal data directory (/data/data/com.cshubh.myapp), which is inaccessible using file managers on the device.

TIL that some companies allow typo tolerance in passwords. Instead of simply rejecting a login attempt with small mistakes, they accept some common typos like an accidental uppercase or an extra character.

I was building contact page for this site where I've put up my email. How do I deal with bots harvesting plaintext emails from websites and sending spam?