What's some cool feature of Factor that other languages don't support?
One small feature that comes in handy is the make word, which assists in building sequences. Another cool feature is Factor's unique object system, which deserves a separate blog post to explain. A third feature is the sequence and assoc protocols, allowing numbered sequences and associative mappings to be treated generically. This isn't something that's uniquely possible in Factor, but Factor's library just happens to be very well-designed here.
