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Novice Question About u.q

New Contributor II
I was examining the u.q library and see this line:

  1. [t;x]each w t

    What does this mean exactly? For each w t pairs?
  2. What is w here as I see it is not an argument of the function? Regarding the (neg first w) I assume that this is supposed to be a handle? If so where is it coming from?
  3. The each is passing 2 params to the lambda but the lambda is expecting 3, do I miss something?
  4. I couldn't get; any elaboration is appreciated.
    sell[x]w 1

Thanks in advance!

New Contributor
read the code  right to left::

first w@t
the result is applied applied one by one to the projected function (not all arguments fixed)