CODEWITHSUNDEEP
luacomputercraft
marcm
marcm

Reputation: 43

How or Can I pass a function with argument as a parameter to a function in lua?

I am not running straight lua but the CC-Tweaks ComputerCraft version. This is an example of what I am trying to accomplish. It does not work as is.

*edited. I got a function to pass, but not one with arguments of its own.

function helloworld(arg)

    print(arg)

end

function frepeat(command)

    for i=1,10 do

        command()

    end

end

frepeat(helloworld("hello"))

Upvotes: 4

Views: 1485

Answers (3)

lhf
lhf

Reputation: 72312

Try this code:

function helloworld(arg)
    print(arg)
end

function frepeat(command,arg)
    for i=1,10 do
        command(arg)
    end
end

frepeat(helloworld,"hello")

If you need multiple arguments, use ... instead of arg.

Upvotes: 2

aschepler
aschepler

Reputation: 72311

frepeat(helloworld("hello"))

will not pass the helloworld function like frepeat(helloworld) does, because it always means what it looks like: call helloworld once, then pass that result to frepeat.

You need to define a function doing what you want to pass that function. But an easy way to do that for a single-use function is a function expression:

frepeat( function () helloworld("hello") end )

Here the expression function () helloworld("hello") end results in a function with no name, whose body says to pass "hello" to helloworld each time the function is called.

Upvotes: 3

An0ther0ne
An0ther0ne

Reputation: 394

"repeat" is reserved word in lua. Try this:

function helloworld()
    print("hello world")
end
function frepeat(command)
    for i=1,10 do
        command()
    end
end
frepeat(helloworld)

Upvotes: 1

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