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Calling a function

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Calling a function

Powermonger OP
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03.03.16 03:57:26 pm

Hi everyone,

I have a question about how to call function from table, similar with this one Function in table.

I want to have a table array that calls the function. Function can't exist in table, because I want it to be called from other sources.

Not like this

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table = {
[1] = {name = "Drop",func = TMMdrop(id) *do stuff here* end}}

But more like this

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function TMMdrop(id)
-- stuff
end
function TMMtake(id)
-- stuff
end
function TMMequip(id)
-- stuff
end

function TMmenu(id,t,b)
local data = {
[1] = {name = "Drop",func = TMMdrop(id)},
[2] = {name = "Take",func = TMMtake(id)},
[3] = {name = "Equip",func = TMMequip(id)}
}
for i = 1,#data do
if type(data[i]) == "table" and t == data[i].name then
	data[i].func(id)
	break
end
end
end

I hope that you understand what I am looking for and please help me to get there. Thank you very much

Re: Calling a function

VADemon
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Offline

03.03.16 04:23:23 pm

It works, if written correctly. There's a difference between defining a function normally and inside a table.

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local function hello(n) -- a local function will become unavailable in global space after the whole .lua file is loaded and thus it's good for One Time Initialization
	print("Hello: ".. n * 2)
end

powermonger = {
	[1] = {name = "Foo", func = hello}, -- function defined here
	[2] = {name = "Bar", ["func"] = hello}, -- just the same
	[3] = {name = "FizzBuzz"}
}
powermonger[3].func = hello -- same outside the table

Your only mistake: hello(n) will execute the function IMMEDIATELY. Since the function does not return any value, NIL will be saved to func.
hello by itself only refers to the function as an object/variable.

For example:

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function returner(n)
	print("Returning: ".. n * 2 + 1)
	return (n*2+1)
end

print(type( returner ))
print(type( returner(123) ))

edited 1×, last 03.03.16 04:48:49 pm

Re: Calling a function

GeoB99
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Offline

03.03.16 04:24:16 pm

To call a function and its reference inside an array you'd normally just assign them within a local similarly to this:

local a = {myfunc = function(a,b,c) return a,b,c end}

In your case it should be like this.

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local a = {TMMdrop = function(id) end}
local b = {TMMtake = function(id) end}
local c = {TMMequip = function(id) end}

Note that the local value must be assigned with your function name (a.TMMdrop for example) depending on your wish and needs. Hope that helps.

Re: Calling a function

Powermonger OP
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03.03.16 05:30:24 pm

Thanks for your fast answers!

I ended up using a mix of my and VADemon's script.
The function must be global so I edited that.

And I just realised something... the example that I wrote also works in other way, with one edit:

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[1] = {name = "Drop",func = TMMdrop},  -- took (id) away
[2] = {name = "Take",func = TMMtake},
[3] = {name = "Equip",func = TMMequip}

It allows function calls in global tables.

Quote

You learn something new everyday.
- Ray LeBlond

Thank you guys very much for your help. I really appreciate it.

Have a nice week everyone!