Box

A box which might (FullBox) or might not (EmptyBox) contain a value

Box(x:Any)

Convert anything to Box (always FullBox)

Box(n:Null)

Convert null to Box (always EmptyBox)

Box(a:Arr)

Convert array to a Box. Throws InvalidArgument if length of the array is not 0 or 1.

Box(a:Arr, idx:Any)

Convert array value indexed by the given index

Box(h:Hash, k:Any)

Convert hash value indexed by the given key to a Box

==(b1:Box, b2:Box)

Compare boxes. Empty boxes and boxes with same content are considered to be equal.

any(b:Box, predicate:Any)

Test Box value

none(b:Box, predicate:Any)

Test Box value

to_exit_code(b:Box)

Zero for FullBox and one for EmptyBox

Types