Sparkline in unicode: Difference between revisions

Or, by composition of pure functions, with type comments for the reader, rather than the compiler.

To vary the approach, the block index value is derived here as an option type,

in a search over 7 zero-indexed bounds [0..6].

The index used is either just that of the first bound found to exceed the given data value,

or 7, if the search result was 'not found' (Nothing).