function
boot.janet on line 1029 , column 1
(accumulate2 f ind )
The 2-argument version of `accumulate` that does not take an
initialization value. The first value in `ind` will be added to the
array as is , so the length of the return value will be `(length
ind)` .
(reduce2 + [1 2 3 ]) # -> 6
(accumulate2 + [1 2 3 ]) # -> @[1 3 6]