Nullish

Nullish coalesing

Symbol: ??.
Translated to JavaScript nullish coalesing operator.
Takes 2+ parameters.

?? null 2

Default parameters

Symbol: ...
Takes 2 parameters.

.. a 1

The following example prints 2:

= add -> ((.. x 1)) (+ x 1)

= result (add ())

console.log(result)

The following example prints 1:

= object (: (b 2))

= (: (.. a 1)) object

console.log a