Fexl - a Function Expression Language

Fexl is a simple but powerful functional scripting language. It allows you to manipulate numbers, strings, streams, and functions easily and reliably, all within a secure "sandbox". (Fexl is pronounced fex'-uhl, similar to "pixel".)

Fexl source code at GitHub Updated Sat 2026-08-29
Fexl by Example
Technical Introduction to Fexl Updated Sat 2026-08-29
Guide to configuring a new installation
Guide to control structures in Fexl
Modularity
Interfacing with C
Big numbers
Modular arithmetic
Opinionated programming
Template expansion
Parsing
Tuples
Translating Perl to Fexl Updated Thu 2026-08-06
Porting Fexl to Windows using WSL
Notes