Luau Recap: March 2020

[acreol]

@zeuxcg

xpcall now supports yielding

I don’t really like this update, broke some of my code:

local function noyield(f,...)
	return select(2,assert(xpcall(f,debug.traceback,...)))
end

It was imo a clean wrapper to call functions and error if the function yields (very useful for non-production code). Now I have to switch to __index or a for loop iterator call (or is there a cleaner way?) to get this same behavior.

I think we can always make a yielding xpcall ourselves (is this wrong?):

Xpcall still cannot yield across metamethod/C-call boundary

I was about to make a post about this but this one already exists. xpcall can’t yield, ypcall is obsolete, pcall can yield. xpcall should be able to yield like pcall can, otherwise I have to overwrite xpcall myself like this local function xpcall(f, handler) -- yielding xpcall local success, response = pcall(f) -- regular pcall can yield, xpcall can't if success then return true, response else return false, handler(response) end end

But ideally the above noyield is Roblox provided and imo xpcall shouldn’t exist (if the above is just as powerful).