macro
boot.janet on line 2346, column 1
(short-fn arg &opt name)
Shorthand for `fn`. Arguments are given as `$n`, where `n` is the
0-indexed argument of the function. `$` is also an alias for the
first (index 0) argument. The `$&` symbol will make the anonymous
function variadic if it appears in the body of the function, and
can be combined with positional arguments.
(map (fn [x] (< x 10)) [8 9 10 11]) # => @[true true false false]
(map (short-fn (< $ 10)) [8 9 10 11]) # => @[true true false false]
(map |(< $ 10) [8 9 10 11]) # => @[true true false false]