macro
boot.janet on line 193, column 1
(unless condition & body)
Shorthand for `(when (not condition) ;body)`.
(let [x false]
(var y 0)
(unless x
(++ y)
(++ y))
y)
# => 2(var x 10)
(unless (= x 10)
(print "x is not 10!")
(print "x is 10!"))
# => "x is 10!"