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About LFE

(defmodule leap
  (export (leap-year 1)))

(defun leap-year
  ([year] (when (=:= (rem year 400) 0))
  ([year] (when (=:= (rem year 100) 0))
  ([year] (when (=:= (rem year 4) 0))

57 coding exercises for LFE on Exercism. From Beer Song to Scrabble Score.

Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.

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Key Features of LFE


Core Erlang Foundation

With LFE, you can use Lisp features while reaping the benefits of Erlang VM.


Take advantage of features such as Function Composition and Pattern Matching.

Fault tolerant

LFE runs on the Erlang VM, ideal for low-latency and fault-tolerant systems.


LFE brought homoiconicity to the Erlang VM, as it supports Symbolic expressions.

Hot Code Loading

With LFE you can upgrade running systems without restarts, via hot code loading.


LFE supports metaprogramming via low-hygiene macros, ideal for creating DSLs.

Get mentored the LFE way

Every language has its own way of doing things. LFE is no different. Our mentors will help you learn to think like a LFE developer and how to write idiomatic code in LFE. Once you've solved an exercise, submit it to our volunteer team, and they'll give you hints, ideas, and feedback on how to make it feel more like what you'd normally see in LFE - they'll help you discover the things you don't know that you don't know.

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Community-sourced LFE exercises

The LFE track on Exercism has 57 exercises to help you write better code. Discover new exercises as you progress and get engrossed in learning new concepts and improving the way you currently write.

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