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Am 26.09.2018 um 17:46 schrieb Scott Morgan:

On 14/09/2018 20:57, Jim wrote:
Some sugar maybe but something along the lines of:

   if item = find_something() then
     item:do_stuff()
   end

With `item` being local to the if scope, and not polluting the wider
block. So effectively it translates to this

   begin
     local item = find_something()
     if item then
       item:do_stuff()
     end
   end

Could probably do with it in while loops too.

Seems to flow with the for loop syntax, so not that wild an idea :)

Scott


Hmmm.
To me this is to close to the = vs == discussion in Languages like C, JavaScript, etc. 
It is for a reason that in Lua an assignment is not legal in an expression.

What about:
when( find_something() ):do_stuff()
with when() being a function that returns the parameter or a table with a do_stuff method without effect? 
local function when( this ) return this or { do_stuff = function() end } end

For arbitrary do_stuff()s metatable's __index is your friend...

--
Oliver