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FACT is currently in the process of being completely rewritten. The current code sucks.

Welcome to the FACT wiki! FACT is a concurrent, functional programming language which hopes to combine many aspects of procedural languages with object-oriented languages, without the burden of extra syntax. The name FACT stands for "Functions Are Classes Too." FACT is very similar to many functional languages. A major aspect of FACT is that first-class environments are used as the primary data structure. For a guide on using FACT, view How-to-use-FACT.

Here's a tail-recursive factorial example: scope factorial @ (num x) { return (scope fact_rec @ (num x, num n) { if (n > 1) return fact_rec (x * n, n - 1); else return x; }) (x, x - 1); }