Both versions work like a charm. Thanks a million!
(written without access to a Lua interpreter, bugs unlikely but possible)
local function xpack( x, ... )
return x, table.pack( ... )
end
function suppress( f, ... )
local _, rets = xpack( pcall( f, ... ) )
return table.unpack( rets, 1, rets.n )
end
-- nobody
On 27/10/2020 20.25, Grzegorz Krasoń wrote:
> Function that returns nothing seems different than function that returns
> `nil`:
>
> ```lua
> function f()
> return nil
> end
>
> function g()
> end
>
> print(f()) -- prints nil
> print(g()) -- prints empty line
> ```
>
> How to recognize this at the function call? For example how to implement
> an universal wrapper that would suppress all errors and still returns
> exactly the same thing as wrapped function in case of success?
>
> ```lua
> function supperess(f, ...)
> success, result = pcall(f, ...)
> return result
> end
>
> print(supperess(f)) -- prints nil
> print(supperess(g)) -- also prints nil, how to fix it?
> ```
