Small coffeescript mixin function. Allows multiple inheritance.

mixin.coffee

mixIn = (classes...) ->
  classes.reduce ((o,n) -> o::[key]=method for key,method of n::;o), (class)

use.coffee

#How to use:
mixIn = (classes...) ->
  classes.reduce ((o,n) -> o::[key]=method for key,method of n::; o), (class)

class A
  a: -> "I'm class A"

class B
  b: -> "I'm class B"

# Here is the magic: C inherits of A and B
class C extends mixIn A,B
  c: -> "I'm class C"

c = new C
console.log c.a(), c.b(), c.c()