Box

Most users won't need Box, it is used for:

Holding unknown Roc types when developing platforms.
To improve performance in rare cases.

box : a -> Box a

Allocates a value on the heap. Boxing is an expensive process as it copies the value from the stack to the heap. This may provide a performance optimization for advanced use cases with large values. A platform may require that some values are boxed.

expect Box.unbox (Box.box "Stack Faster") == "Stack Faster"

unbox : Box a -> a

Returns a boxed value.

expect Box.unbox (Box.box "Stack Faster") == "Stack Faster"