Method upwardsOrDownwards

src/main/java/fieldbox/boxes/Box.java:280–286

returns direction that goes upwards if it can, otherwise downwards.

()

	/**
	 * returns direction that goes upwards if it can, otherwise downwards.
	 */
	@HiddenInAutocomplete
	public Function<Box, Collection<Box>> upwardsOrDownwards() {
		return x -> {
			if (x.parents().size() > 0) return x.parents();
			return x.children();
		};
	}