Lua script for fancy named parameters with default values

example.lua

local fp = require "fancyparams"

myfunction = fp(
  {{"a"},{"b",7},{"c",5}},
  function(a, b, c)
    print(a, b, c)
  end
)

fancyparams.lua

local unpack = unpack or table.unpack

local function fancyparams(arg_def,f)
  return function(args)
    local params = {}
    for i=1, #arg_def do
      local paramname = arg_def[i][1] --the name of the first parameter to the function
      local default_value = arg_def[i][2]
      params[i] = args[i] or args[paramname] or default_value
    end
    return f(unpack(params,1,#arg_def))
  end
end

return fancyparams