opt

opt

This operator accesses the optional arguments sent to a function.

(fun foo ()
    (list opt.x opt.y opt.z))

(foo x: 1 y: 2 z: 3) -> (1 2 3)
(foo x: 1 y: 2) -> (1 2 null)
(foo) -> (null null null)

At the top level of a program, opt holds a list of command line options that were preceded by dashes.

; foo.sxy

(sys.say opt)

; command line

./sexy run foo.sxy -x 1 -y 2 --cheese yes
(record: x 1 y 2 cheese yes)