Differences between group() and chunkBy()

[Dennis]

On Wednesday, 14 November 2018 at 12:28:38 UTC, Per Nordlöw wrote:
> Is it because of `group` has a default for the predicate 
> whereas `chunkBy` hasn't.

chunkBy splits the range into smaller ranges, group actually 
returns tuples of the item and the amount of occurences. Because 
in group the condition is fixed to equality, it's redundant to 
return a range of [2, 2, 2, 2, 2, 2] for example when you can 
simply return a tuple (2, 6).

The example:
group([5, 2, 2, 3, 3]) returns a range containing the tuples 
tuple(5, 1), tuple(2, 2), and tuple(3, 2).

Is a bit confusing since tuple(2, 2) looks like it could be a 
range of two 2's as well.