Example usecases of JS-CLOS https://github.com/ympbyc/js-clos

bump.coffee

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#||||| example of multiple dispatch |||||
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floor  = define_class []
carpet = define_class []
ball   = define_class []
glass  = define_class []

bump = define_generic()

define_method bump, [ball, floor],        -> 'bounce'
define_method bump, [glass, floor],       -> 'crash'
define_method bump, [undefined, carpet],  -> 'silence'

bump ball, floor                 #bounce
bump (make ball), (make floor)   #bounce

bump glass, floor                #crach

bump ball, carpet                #silence
bump glass, carpet               #silence

clos-fact.coffee

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#||||| example of multimethods |||||
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#fact

fact = define_generic()

define_method fact, [0], -> 1

define_method fact, ["number"], (n) ->
  n * fact (n - 1)

fact 5
#=> 120

import.coffee

# import
c = require 'clos'
this[name] = fn for name, fn of c

lion.coffee

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#||||| example of multiple inheritance |||||
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# domain
animal = define_class [], (x) ->
  slot_exists x, 'voice', 'string'

cat = define_class [animal]

osx = define_class [], (x) -> 
  slot_exists x, 'hostname', 'string'

lion = define_class [cat, osx]

# definitions

say = define_generic()
define_method say, [animal], (a) -> a.voice 
define_method say, [cat], (c) -> c.voice + ' meow'

hostname = define_generic()
define_method hostname, [osx], (o) -> o.hostname

# main

alice = make lion,
             voice: 'roar'
             hostname: 'example.com'

say alice
#=> 'roar meow'

hostname alice
#=> 'example.com'

Is this a bug?

  var fib = define_generic(true); 
  define_method(fib, [0], () => {return 0;});
  define_method(fib, [1], () => {return 1;});
  define_method(fib, ["number"], (n) => {
    return fib(n-1) + fib(n-2);
  });
  define_method(fib, [undefined], () => {return "default";});

  /// .....
  console.log(fib(17));
  console.log(fib({}));
  console.log(fib("number")); // ... error

Sorry for a late reply. I haven't been active on github lately.
It seems to be a bug indeed. Somewhere around these lines: https://github.com/ympbyc/js-clos/blob/master/clos.js#L117
I'll look into it when I have time. Thanks

Hello, and sorry too for abandoning js-clos. Lately I came with a minimalistic lisp-on-JS implementation which though already has macros and dynamic scope. Just wanted to share the link now. https://github.com/neverblued/aynil

Thank you @neverblued That's nice.
Glad to hear from the original author!
JSCL seems exciting too.

Dicided this isn't a bug and expected behaviour. Fixing it will involve introducing something like CL's eql-specializer, which isn't a bad idea to pursue but because it's a sketch, if it works for 99% I say it's a pass.