macro
boot.janet on line 1333, column 1
(as-> x as & forms)
Thread forms together, replacing `as` in `forms` with the value of
the previous form. The first form is the value x. Returns the last
value.
(as-> [1 2 3] _
(map inc _)
(sum _)
(- _ 10)
(< _ 0))
# -> true
# same as
(< (- (sum (map inc [1 2 3])) 10) 0)