method as function parameter

[muescha]

i like to do some stuff with a method of an object - in this case hs.hotkey:disable()

local hotkeyhandler = hs.hotkey.bind(...)

function myFunction(fn)
	print("myFunction start")
	fn()
	print("myFunction end")
end

-- working
myFunction(function() hotkeyhandler:disable() end)

-- not working - i get an error
myFunction(hotkeyhandler:disable)

-- not working - i get an error
myFunction(hotkeyhandler.disable)

where is my mistake so i can not call it with fn()?

[Rhys-T]

Unfortunately, there's not really a syntax in Lua for what you're trying to do. Lua doesn't have 'bound methods' like in, say, Python. When you write foo:bar(baz), foo:bar by itself doesn't really exist - the colon is as much a part of the call syntax as the parentheses are!

If you want something shorter than writing an anonymous function wrapper each time, you can write a function to generate those wrappers for you:

-- 'M' for 'method'. You can name this whatever you want.
function M(object, name)
	local func = object[name]
	return function(...)
		return func(object, ...)
	end
end

myFunction(M(hotkeyhandler, 'disable'))

[cmsj]

Marking as closed because @Rhys-T is correct and wrapping the method call is the correct choice here.