Why would anyone ever want to do this? Reasons...

inject-args.coffee

injectArgs = (func, args...) ->
  rawFunc  = func.toString()
  argNames = (a.trim() for a in (/function \((.*)\)/.exec rawFunc)[1].split(','))
  func     = rawFunc.replace /function \((.*)\)/, 'function anonymous()'

  if args.length != argNames.length
    throw new Error 'Function arity must match number of passed arguments'

  unless args.length > 0
    return new Function func

  argDeclarations = []
  for name in argNames
    argDeclarations.push name + '=' + JSON.stringify args.shift()

  new Function """
    var #{argDeclarations.join ','};
    return (#{func}).call(this);
  """

f = injectArgs (x, y, z) ->
  console.log x, y, z
, 1, 2, 3

console.log f.toString()
f()