Re: select("#", ...) idiom

[Roberto Ierusalimschy <roberto@...>]

> Perhaps I missed this?  What is its meaning?

... is an expression. #exp returns the length of the result of exp.
So, #... is the length of the first argument of a vararg function.
Try this:

  function f (...) return #... end
  print(f("hi", 4, 5))


Similarly, <<for i, v in ...>> also has a meaning. See next example:

  function f (...) for i,v in ... do print(i,v) end end
  f(pairs{2,4,5})

-- Roberto