Call Functions with string

Why I can call the function test with the string func and the args arg?

function test(text)
 print(text)
end

func = "test"
arg = "hello World"

I'm not entirely sure what your question is, but here's my best guess at an answer.

function example(input)
  print(input)
end
example("this is a test") --#calling the function
word = "second test"
example(word) --#passing a variable

I want to write

func(arg)

to call function test

Umm… You could achieve that with a lot of metatable magic I think. Or, actually… You can't because the string metatable is "hidden".

You could try to do

getfenv()[func](arg)

function test(text)
  print(text)
end

func = test
arg = "hello World"

You were setting func to the string "test". This sets func to equal test so you can call func(arg).

Dog, on 15 June 2016 - 06:02 PM said:

function test(text)
  print(text)
end

func = test
arg = "hello World"

You were setting func to the string "test". This sets func to equal test so you can call func(arg).

I believe the OP want's to call a function using a string, and not a pointer. Although your approach would "fix" the problem too.

H4X0RZ, on 15 June 2016 - 05:31 PM said:

You could try to do

getfenv()[func](arg)

This seems correct to me. But I'd instead suggest:

local funcs = {}

funcs.test = function(text)
  print(text)
end

local func = "test"
local arg = "hello World"

funcs[func](arg)

… as dumping everything into the environment table (as globals) is messy.

http://lua-users.org/wiki/ScopeTutorial

Thanks. But both methods work only with functions in the same script. if I load an API, it doesent work.

Method 1

--Script
os.loadAPI("/testapi")
func = "testapi.test"
arg = "hello World"
getfenv()[func](arg)
--testapi.test works

--testapi
function test(text)
  print(text)
end

Method 2

--skript
os.loadAPI("/testapi")
func = "test"
arg = "Hello World"
funcs[func](arg)

--testapi
funcs = {}
funcs.test = function(text)
  print(text)
end

That does not work. How can I call function from another skript?

Both of the methods have a similar problem when trying to use an api

It would need to be getfenv()["testapi"]["test"](arg)

If you wanted to use an api with the first method you would probably want to do something like:

func = "testapi.test"
arg = "hello world"

local function callFunc(func,arg)
  local fenv = getfenv()
  for word in func:gmatch("[^ %.]+") do
	fenv = fenv[word]
  end
  return fenv(arg)
end

callFunc(func,arg)

For the second method you would need to use testapi.funcs[func](arg)

The problem you are experiencing is due to how variables/functions are loaded into apis.