possible implementations for partial application with pre-evaluated bound arguments and function target in CoffeeScript. See https://github.com/jashkenas/coffee-script/pull/2597

partial-impl.coffee

# With an helper function:
partial = (fn, a...) -> (b...) -> fn a..., b...
add_3 = partial add, 3

# With an IIFE:
add_3 = do (fn=add, a=3) -> (b...) -> fn a, b...
# note: because we know the number of bound arguments at compile-time, the do() IIFE could be
# compiled with the exact number of arguments, rather than with a splat.
# the do thingy is the same as `add_3 = ( (fn, a) -> (b...) -> fn a, b... ) add, 3`

# Or with a bunch of temporary variables:
ref1 = fn
ref2 = 3
add_3 = (b...) -> ref1 ref2, b...