This is a simple functional language simulator supporting lambda, let
expressions, and simple arithmetic.  The language syntax follows
Haskell, mostly.  The idea is, the simulator allows the user to select
a redex to reduce; this way, they can easily explore different
reduction strategies without doing it by hand.

Just open index.html in Chromium to use, or put this directory up on
http(s) and open it in Chromium.  There are usage instructions on the
page.  Other modern browsers ought to work as well but have not been
tested.

Development happens at https://github.com/ajkaijanaho/fsim .  Bug
reports preferably as GitHub issues.  You may contact me at
antti-juhani@kaijanaho.fi.

The program is licensed as

  Copyright 2015, 2016 Antti-Juhani Kaijanaho

  Permission is hereby granted, free of charge, to any person
  obtaining a copy of this software and associated documentation files
  (the "Software"), to deal in the Software without restriction,
  including without limitation the rights to use, copy, modify, merge,
  publish, distribute, sublicense, and/or sell copies of the Software,
  and to permit persons to whom the Software is furnished to do so,
  subject to the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.