Lua Question: Passing Functions with parameters?

Guides UI and Macro
1

Suppose I have a function that takes, say, 3 parameters as in sum() below. Now, I want to pass sum() to another function, run(). How exactly do I set this up in Lua? Here’s what I’m trying to do:

local function sum( a, b, c )
    return a+b+c
end

local function run( sum ? )
    local n = sum( ? )
    return n
end

I do not believe this to be a varargs question because I will always know the exact number of arguments in the function to be passed.

The motivation behind this question arises from the coroutine.create() function. This function takes a single argument, a function. I want to pass a function to coroutine.create() that takes, say, 1 argument. For example,

    local function f( arg1 )
    ... do stuff
    return something
    end

    local co = coroutine.create( f )

Thanks,

2 
local function sum( a, b, c )
    return a+b+c
end

local function run(f, ...)
    local n = f(...)
    return n
end

SLASH_XXX1 = "/xx"
function SlashCmdList.XXX(msg)
  print(run(sum, 4, 7, 9))
end

You could change the … in run for 3 parameters but I’m not sure if this is what you are looking for over calling sum() directly.

What are you trying to achieve?

3

The coroutines parameters are passed in the resume (created coroutes start in a suspended state):

local function sum( a, b, c )
    return a+b+c
end

local function run(a, b, c )
    local n = sum( a, b, c )
    return n
end

local c = coroutine.create(run)
print(coroutine.resume(c,1,2,3))

Incidentally, lua supports closures too which can be convenient at times:

local function sum( a, b, c )
    return a+b+c
end

local function total(a,b,c)
  local function run()
    local n = sum( a, b, c )
    return n
  end
  return run()
end

print(total(1,2,3))