Passing parameter to a callback function
 

When using a callback function with RegisterForEvent, is there a way I can specify a parameter that the callback uses? For example:


I can't simply pass BarTracker.toggleVisibility(true) as the 3rd parameter since that immediately invokes the function. In JavaScript, I could use bind or the syntax (() => BarTracker.toggleVisibility(true)) since that won't invoke it, but still passes the parameter when the callback is called. Does Lua have something similar? I don't know exactly what this is called so I couldn't find anything on SO.

EVENT_MANAGER:RegisterForEvent(BarTracker.name, EVENT_ACTION_LAYER_PUSHED, function() BarTracker.toggleVisibility(true) end)

It's basically shorthand for something like below. The only difference is that in the code below, the function has the name TurnOffVisibility, while in the code above, the function is anonymous.


I suppose "function() BarTracker.toggleVisibility(true) end" might be the same as your JavaScript example? Is "(() => BarTracker.toggleVisibility(true))" a function?

There is no equivalent to lambda functions in Lua, so the most direct comparison would simply be an anonymous function in js:
You may think they do the same, but as with many things in JS there are fine and easily overlooked differences that will make your life as a developer a living hell if you don't know about them. ;)

Thanks! That did the trick.